Need Help, Possible new WP7 WIFI bug? - Windows Phone 7 Q&A, Help & Troubleshooting

(This is not device specific errors.)
HTC HD7, used for 2 months. From 2 days ago. basically stopped connecting to WiFi networks with NEW names. As soon as taping on the new network, it goes to 'connection unsuccessful' error instantly. (Not even trying to connect), while my other devices working fine on these networks. The phone is actually able to connect to any other wifi network it had previously remembered (SSIDs like linksys, netgear, even other hotel wifis, coffee wifis,). I have tried at least 10 different new wifi network, the phone simply refused to connect..
Note with 'secured network', phone asks for a password, but as soon as taping 'done', error message appearing straight away (connection unsuccessful, note, if typed wrong password, does give a different error, 'invalid password') and ask to retype password. Note, this is not due to wrong password, the password has been thoroughly tested.)
Any ideas?? I have been travelling a lot with my phone these two months. Like 10 different cities...imagine the number of wifi profiles saved in my phone?? like 100+?? The windows phone give up on me?? Comeon....my iphone has not done that in 3 years....
Additional note, the tested networks are 802.11b/g not n. So should be fine......
Since this HALF BUILT windows phone 7 SW does not have other useful menus that allow me to explore a bit further in the phone. All I can do is just restart wifi, phone.....I do not want to reset..BTW, the SW does not offer reset setting option...only reset whole phone.....?
Possible solution:
1. I have read through this forum. Looks like it is possible to play with the registry files (to remove some of the wifi profiles)?
2. When I get home, I will change my home router to the SSIDs that the phone might have connected to and delete them when they pop up to free some space. This way, I should be able to verify my theory!

If you long press a remembered wifi profile, you get the option to delete it

Yes, of cuz. But u have to let the remembered network to appear in your list in the first place? How do you do that when u r travelling around?
This is just ridiculous.
I am seeking methods outside what I mentioned above.

Waiting for someone to help here...

I have tried to change my home network SSID to those the phone had previously remembered and made some discovery.
Basically the phone is able to connect to thos old SSID given they are unsecured. I was also able to delete those profiles...
However, here is the however, after deleting several old profiles, I still was not able to connect to new wifi network...And what was worse, after restarting the phone, I cannot connect to the previous SSID I have just deleted....
Basically, the phone has stopped accepting new Wifi profiles....This is some serious software bug.

A SW that is full of BUG and no fixes and no one cares...

OaG_sGm said:
A SW that is full of BUG and no fixes and no one cares...
Click to expand...
Click to collapse
I imagine Microsoft tech support would care if you called them.

The only thing you can try is to hard reset.
Sent from my OMNIA7 using Board Express

OaG_sGm said:
A SW that is full of BUG and no fixes and no one cares...
Click to expand...
Click to collapse
I didn't realize we worked for MS. Like most severe smartphone problems, you need to hard reset. If you talk to MS support they will tell you that, if you call the OEm, they will tell you that as well.
edit: and how do you know this isn't device specific?

The OP is correct. There is no way to delete remembered wifi networks without actually being in its vicinity. I have had this problem. Sometimes, a soft reset fixes the problem. Other times, I delete the network, then try reconnecting. Other times, if the router is accessible, a quick power rest fixes the problem. Also, sometimes, connecting to another network, deleting it, and then reconnecting back to the desired network solves the problem.
However, there are times that the wifi simply refuses to connect no matter what.

This looks more like an software problem. But I should not have said it is not a device specific problem 100%.
Till today, I have used Tune to backup my pictures...but have not decided to reset it yet. Cuz a lot of things need to be manually restored..
I think I will wait for the first important update come out and see if that fixes anything.
All of these arises because the OS is like a rush job, a lot of functions and menus simply does not exist.....
My phone still refuses to connect to ANY NEW wifi network. Including the one it remembered (if I delete them)

This problem has not been solved still. Just wondering is any body else having the same problem?

just ride off wp7, go for android htc desire hd,this thred will go for soooooooo many pages until you get solved your problem.please dont waist your time here like me.

This problem has been FIXED with March update!!! Now the phone runs faster and there are heaps of apps. Now I am waiting for flash and skype api etc...

Related

[Q] Enabling Wi-Fi Crashes HD7

My HD7 worked without issue from the beginning of the year til around a month ago.
All of a sudden, my WiFi became extremely unreliable, sometimes taking an overly long time to recognise or connect to an obvious access point, sometimes finding none at all.
After I do manage to connect wirelessly, I see no speed increase in data transfer to suggest that the phone is even using the wireless link. Web pages sometimes load slower than over 3G. I had read that HD7s have trouble using certain WiFi protocols and adjusted accordingly, but the workaround was to no avail.
Additionally, once WiFi has been selected, I cannot switch it off. I am 'locked out' of the WiFi settings page. When I tap it in the menu it responds as if I've nudged it but it cannot load. The only solution is to remove the battery. On occasion, this stuck WiFi has also caused the capacitive buttons, camera and power switch to become inactive. Curiously, touch screen function seems unaffected.
I thought maybe this issue was tied to corrupt settings with my hub, but changing SSID / WEP key etc etc on my router hasn't fixed the problem, and connection to other open WiFi signals jam the phone just as badly.
I upgraded to Mango in the hope that a fresh OS update may 'rejig' my wireless settings into working, but again, no joy.
Anyone experienced anything similar? My final options seem to be factory reset the handset to see if that solves the issue, or return the handset to O2. (Both involve losing all my data, game saves, application data AND the recently delisted SW: Battle for Hoth permanently.)
Anyone got any other thoughts?
*EDIT* After a bit more research, I found that even when the phone has connected to a WiFi source, by turning Operator Data Service off, you can see that the WiFi service is in fact not doing anything.
I braved a factory reset, managed to whack WiFi on no problem, browser ran at appropriate speed, then everything crashed as per usual, I couldn't connect to the marketplace and had to pull the battery in order to use any of the capacitive buttons. I guess it was a hardware issue individual to my phone after all.
Guess I'll give O2 a ring sometime soon to sort a replacement. Not looking forward to losing all my game progress though it has to be said.
bro i m having the same exact problem havent find any solution yet i even tried to copy and replace the wifi files from another clean htc hd7 but useless when i upgraded to 7740 the wifi worked perfectly for 1 night only then at the morning it stopped working, everything else works great. my theory says that its not a hardware problem cz i used internet sharing which uses the wifi adapter (if i m right) so its a software I GUESS
soufano21 said:
bro i m having the same exact problem havent find any solution yet i even tried to copy and replace the wifi files from another clean htc hd7 but useless when i upgraded to 7740 the wifi worked perfectly for 1 night only then at the morning it stopped working, everything else works great. my theory says that its not a hardware problem cz i used internet sharing which uses the wifi adapter (if i m right) so its a software I GUESS
Click to expand...
Click to collapse
I had the same problem as well, couldn't connect, got to the point where even the power button stopped responding. Hard resets would only help for a short time and enabling WIFI would never connect right and eventually get me back to the same problem. I then got a replacement device, but it's not much better, I still can't connect to any WIFI, but at least it's not freezing up on me. My solution thus far has been just to avoid turning on WIFI if at all possible, but it's far from a perfect workaround. I'm guessing it's the HTC WIFI driver that's got issues.
i got similar problem.. send phone to service problem was "circut board"
replaced working fine...
when i was using wifi my phone was freezing some menus stop working and i have to remove battery

[Q] No Data and Wifi data transfer (but connected))

Hi guys,
I'm using moto g for about 2 weeks and everything was fine until yesterday. I will try to explain what I've chronologically. My phone isn't rooted. Android 4.4.2, 174.44.9.falcon_umta.Retail.en.GB, KLB20.9-1.10-1.9
For last few days I was testing some battery stretching apps, such as Juice Defender, 2x Battery, GreenPower and maybe one more, but I don't remember the name.Finally I've bought Juice Defender Plus as that app was something that I needed (control mobile and wifi in an intelligent way, but that's not the point). Before JD I've uninstalled other battery aps (but without reverting their settings to defaults). Then I've installed JD, configured it and started to learn JD with my wifi network, whatever.
Next day I went to work and I'm not sure if mobile network was working or not, but wifi network was ok. Updates, synch, etc. was working well. I've installed 2-3 new apps (don't remember, but it was camera360, total commander with few plugins, and maybe something more). Then I've left wifi network, entered car and connected with mobile network. From this point everything stopped to work. There was no connection to any site, no synch from google, weather, and so on. Icon on top of the screen informed me that connection is online (with H or H+, sometimes worse, but probably it doesn't matter). I've tried to connect with many apps to Internet, but none of them succeeded... I thought that maybe there is something wrong with mobile and after that, when I get back to wifi coverage, everything will rise and shine.
Unfortunately when I get back to wifi zone, phone found new network and connected to it. It doesn't matter what network it is, because few days ago I was working with that wifi net and more on that, laptop connected to that network works like a charm. As I said, connected, data transfer in 3g watchdog shows very little net usage (about 200-300B/s). Can't load web pages, can't sync. The same behavior as in mobile, there is connection, very little data usage, but nothing more, no web pages, no sync, etc..
I've restarted phone many times, entered in airplane mode, removed, cleaned and inserted back the sim card - none helped. I've checked ip, gateway and dns which came from dhcp router in wifi network. Everything was fine, addresses were the "same" as my laptop (beside ip address, which was different). I've checked what's up with JD, then I've disabled it, uninstalled..., checked transfer limit for mobile, turned on and off mobile, wifi in many ways. Checked proxy in browser (chrome).
The result was always the SAME.
in chrome: entered address, page starts to load, nothing shows and stalls, after a little while (tens of seconds) there was a message telling me something like: page is unavailable (I can't remember the right message).
in gmail: sync lasts forever, when I send email (to myself) it popups message about sending, but it disappears in a while, a no new email...
other apps, for example, weather on main screen, sync could last to eternity, and no new data.
Today, after whole day without wifi coverage I went back to wifi zone and tried to connect to it... and all emails, sync, whatsup and so on, updated. I think that, I didn't change nothing, but why wifi started to work? I don't know.
I've checked if mobile Internet works as it should, but without any positive results. In mobile there is the same problem as for a last 2 days...
Does someone know any solution to my problem?
PS: I've even tried to enter ip address of wp.pl host, and then phone redirected me to address: 194.9.223.70/ns/cs/deny.html?trx=...something&tpd=3&ts=somenumber&sid=HTTP_DRSTD&url=...mobile[dot]orange[dot]pl
Are you able to send & receive calls? Have you checked your APN as well? Wondering if one of the apps you've tried has changed a setting or set itself as some kind of proxy that your phone's still trying to use even though you've uninstalled it.....not sure......had a similar experience when I tried out a firewall app & removed it without disabling the settings it applied. Can't think of anything else, sorry mate
Sent from my XT1032 using Tapatalk
samanderson said:
Are you able to send & receive calls? Have you checked your APN as well? Wondering if one of the apps you've tried has changed a setting or set itself as some kind of proxy that your phone's still trying to use even though you've uninstalled it.....not sure......had a similar experience when I tried out a firewall app & removed it without disabling the settings it applied. Can't think of anything else, sorry mate
Sent from my XT1032 using Tapatalk
Click to expand...
Click to collapse
Yes, sms and calls works fine. APN is okey, moment ago I've sent configuration sms for internet apn from my operator. I know that it could be one of my apps, which I've uninstalled, but I don' know which one it was .
Might be worth checking device administrators in settings as well just in case the culprits there? Good luck
Sent from my XT1032 using Tapatalk
samanderson said:
Might be worth checking device administrators in settings as well just in case the culprits there? Good luck
Sent from my XT1032 using Tapatalk
Click to expand...
Click to collapse
Checked that, there is only Android device manager (sorry, maybe there is another translation, I'm not using EN lang in my phone) enabled. The rest dev admins are disabled.
Factory reset. That way you start from scratch and if still a problem you can rule out any apps or incorrect config etc. Its the easiest way to narrow down the issue.
scott_doyland said:
Factory reset. That way you start from scratch and if still a problem you can rule out any apps or incorrect config etc. Its the easiest way to narrow down the issue.
Click to expand...
Click to collapse
maybe it's the easiest way, but I think it's not an option if I want to know what was wrong...
Sounds like one of the apps is the problem, as you already suspect. You may have to concede and do a factory reset:
Settings > Backup & reset > Factory data reset​
Please make some effort... factory reset is not the first thing to do when sth is wrong.
hardtmuth said:
Please make some effort... factory reset is not the first thing to do when sth is wrong.
Click to expand...
Click to collapse
I suggested a factory reset as this then rules out all apps and config you have setup. If the problem still happens after a factory reset then you have narrowed down the problem a lot. Possibly it will just fix it though.
However if you want to find the cause of the issue then factory resetting is not the best thing to do as you say. But you seem to have installed a whole bunch of apps in a short space of time so even if you find the problem I doubt you will be able to find out why it happened, ie which app caused it.
You will maybe fix it but never know what caused it or how to prevent it again.
If you factory reset and it fixes it you can take things more slowly this time, is install apps and configure more slowly until you hit the problem, then its easier to see what caused it.
As there was no chance to get other suggestions than "do factory reset" , I've made factory default. Unfortunately, without any change in my problem. Right now wifi works fine, but 3g/data is dead. I've checked my sim card in another phone and 3g/data didn't work too. So I've called to my telco and heard that everything is ok, but probably my sim card is damaged and that's why my data connection is dead. I will try to get new sim card tomorrow.
hardtmuth said:
As there was no chance to get other suggestions than "do factory reset" , I've made factory default. Unfortunately, without any change in my problem. Right now wifi works fine, but 3g/data is dead. I've checked my sim card in another phone and 3g/data didn't work too. So I've called to my telco and heard that everything is ok, but probably my sim card is damaged and that's why my data connection is dead. I will try to get new sim card tomorrow.
Click to expand...
Click to collapse
So those of us suggesting a factory reset were correct then. Had you not reset you would have spent wasted time trying to fix what now appears to be a sim card error. Possibly best not to tell people to 'make an effort' when they are trying to help.

Nearby wifi portal causes constant reboots/restarts

Hi, I am trying to get an idea of how many people this is affecting.
I am on my second T-Mobile Galaxy S6. The first unit had a hardware camera defect as well as this wifi bug. I had them replace it and the new unit's camera is good but it has the same wifi issue. Here's what happens:
When I go to an area with an "open" wifi network, a notification pops up on my screen that says "Click here to connect to null." What's strange is I have almost all wifi features off, particularly "Network notification." It should not tell me when any network is available. I also have "Allow Always Scanning" off as well as Wifi Calling disabled (not that relevant). Anyway, once this happens, I have about 2 seconds to turn off wifi or else the phone will reboot. It's a "soft" restart though, meaning it shows the Samsung and T-Mobile logo then is back on again within 5-10 seconds and fully "booted" within 30 seconds. This will keep happening until I turn off wifi.
It's not just any wifi connection that will cause the issue. I think it has to be an "open" connection that uses a portal for authentication (think universities, hotels, airports, etc). Recently, I clicked on one of the notifications (connect ot null) and saw a Cisco portal. I am not sure if it's isolated to Cisco AP's
I have found about 4 people so far that have reported this issue. I am guessing we are not the only ones. I am guessing it's a software issue.
Have you seen this?
Yes, I have the exact same issue. Sadly I dont know why it's doing it or how to prevent it. I'm located in the Netherlands and when I click login the browser directs me to a KPN Fon login page.
Stolper said:
Yes, I have the exact same issue. Sadly I dont know why it's doing it or how to prevent it. I'm located in the Netherlands and when I click login the browser directs me to a KPN Fon login page.
Click to expand...
Click to collapse
I am very confused what's causing this. Can you confirm what settings you have enabled or disabled? Wifi calling, advanced switching, always scanning, etc? I disable everything and still get it. So it seems like it's not just Cisco login pages. It's also FON. Do you have any areas in your city that have public wifi hotspots with login pages like McDonald's or Starbucks or a university? It'd be great to see if it happens at those locations too.
I don't have wifi calling, advanced switching is disabled, always scanning is on, keep wifi alive in sleep is on. I will check when in the neighborhood of public wifi spots. to see what's happening. Only solution for me now is not using wifi, but that's not very desirable. Have you contacted Samsung about the problem?
Stolper said:
I don't have wifi calling, advanced switching is disabled, always scanning is on, keep wifi alive in sleep is on. I will check when in the neighborhood of public wifi spots. to see what's happening. Only solution for me now is not using wifi, but that's not very desirable. Have you contacted Samsung about the problem?
Click to expand...
Click to collapse
Yes they told me the same things you'd expect. First they said to restart the device. Then clear cache. Then try safe mode. Then finally to do a factory restore. None of these items work. Just curious, is there any way you can easily give me a dump (plain text list) of your apps installed, in a PM? I wonder if it's something software related. I can do the same but I just need to find a tool that can do it.
Edit: I found an app called "List My Apps" in the Play Store. I can't link you because I don't have enough posts under my name. Hopefully I can send you a PM with my list to compare.
wifi null and reboot Samsung galaxy s6
I have the same problem like other guys. My S6 reboot continously when the wifi is on and I am I'm the City ( Zürich -Switzerland)
Then only solution was to switch of the wi fi.
Anybody else expierencing the same issue?
Regards
I'm having the exact same issue. AT&T Galaxy S6 in Southern California.
How do we get this fixed? It's not limited to a provider (that's good).
I already exchanged a unit for the camera issue. I think I am probably past my date for another exchange and quite frankly the first one was such a pain to go through, I'd prefer not to. Anyone have any ideas? I am guessing it's some sort of software issue. Something trips it up when the phone is near a captive portal.
I'm not sure swapping units will help. I did that but it didn't fix it sadly. I contacted SamsungNL and they told me to go to a Samsung repair center to show them the problem. I will try to do that next week. Until then, mobile data only.
Hi guys,
I have contacted Samsung UK and they told me to bring the phone back and ask for a new one. This is not normal and we need a replace.
In the meantime I have try to install FXR wifi Fix and Rescue from play store. Did a reset of my WiFi with this app and since then Its working everything ok. No more Reboots in the last 5 Hours. I was also in public and crossed a lot of open networks but did not report more this issue.
Give it a try.
Regards
damigor said:
Hi guys,
I have contacted Samsung UK and they told me to bring the phone back and ask for a new one. This is not normal and we need a replace.
In the meantime I have try to install FXR wifi Fix and Rescue from play store. Did a reset of my WiFi with this app and since then Its working everything ok. No more Reboots in the last 5 Hours. I was also in public and crossed a lot of open networks but did not report more this issue.
Give it a try.
Regards
Click to expand...
Click to collapse
Samsung UK support are idiots. Seriously, they tell you to return the device for software faults. I contacted them about the LTE signal showing incorrect in the settings, a clear software fault, they said to return the device.
Honestly, Samsung support is useless.
I think no way to stop it atm bcoz it is a software issue, we'll need to wait for an update. I think the baseband of wifi/bluetooth is still not stable, today I heavily played with bluetooth and got a soft reboot too.
Luckily, my HK firmware got no wifi calling and any bugs, my wifi is fine.
damigor said:
Hi guys,
I have contacted Samsung UK and they told me to bring the phone back and ask for a new one. This is not normal and we need a replace.
In the meantime I have try to install FXR wifi Fix and Rescue from play store. Did a reset of my WiFi with this app and since then Its working everything ok. No more Reboots in the last 5 Hours. I was also in public and crossed a lot of open networks but did not report more this issue.
Give it a try.
Regards
Click to expand...
Click to collapse
This seems to be working. I also ran it and it fixed the problem. I think this points towards a faulty wifi database or something.
damigor said:
Hi guys,
I have contacted Samsung UK and they told me to bring the phone back and ask for a new one. This is not normal and we need a replace.
In the meantime I have try to install FXR wifi Fix and Rescue from play store. Did a reset of my WiFi with this app and since then Its working everything ok. No more Reboots in the last 5 Hours. I was also in public and crossed a lot of open networks but did not report more this issue.
Give it a try.
Regards
Click to expand...
Click to collapse
Thanks for posting this. It's the first attempt at a solution I have found. I am going to have to agree with others and say that replacing your device did nothing to help solve the issue. I think its a software issue, perhaps with the wifi drivers or database. I tried running FXR but I won't know if it worked til I get near a captive portal. Keep this thread going guys. This problem is frustrating as heck.
So guys,
I am Happy. In the last week (After I ran the FXR app) looks like the problem is solved for me. No one reboot and any problem with. Null or open networks.
Got 920f model but im not sure is the wifi problem on my phone or not. Phone keep rebooting itself in my pocket. 10 reboots minimum during the day. Tryed flashing another rom but same nothing changet. Not sure its a hardware problem or software.
Will a replacement fix this issue? I'm about to do it tomorrow. But I'd rather not do it if it's not necessary.
UPDATE: I replaced the phone, it did not fix the issue. Seems like we need to wait for an update, unless I am extremely unlucky.
PHPanos said:
Will a replacement fix this issue? I'm about to do it tomorrow. But I'd rather not do it if it's not necessary.
UPDATE: I replaced the phone, it did not fix the issue. Seems like we need to wait for an update, unless I am extremely unlucky.
Click to expand...
Click to collapse
Did you ran the FXR app suggested by @damigor? That fixed it for me.
Stolper said:
Did you ran the FXR app suggested by @damigor? That fixed it for me.
Click to expand...
Click to collapse
I totally missed that post. Trying it right now. I will report back if it worked or not.
Thanks!
Stolper said:
Did you ran the FXR app suggested by @damigor? That fixed it for me.
Click to expand...
Click to collapse
I took replaced my device, but for a real camera issue, not the wifi bug. I agree with Stolpler, running the FXR app completely fixed the issue for me.
For those new to this thread/issue, let me try to explain what's going on and why a phone replacement doesn't work.
The issue is entirely software and I think what's happening is that for some reason, a small amount of us have some corrupted entries in our wireless login database. We all know that if you get a new Android phone and sign into your Google account, all your saved wifi credentials (home, work, school, etc) will be automatically migrated over. That's why you don't have to re-enter your wifi password. For some reason, one of these entries must have gotten corrupted for some reason. Another possibility is for some reason, the way the S6 expects the data/format is different than how Android normally stores it. So say you had an entry from your Nexus 5 for a hotel login. Then now that you're on your S6, it tries to read it and it doesn't like the format so it blows up.
Now, the reason why a phone swap won't work is the moment you sign in with your Google account, it will transfer over your wifi database/settings. If you get a new phone but don't login (ever) to your Google account, I bet the wifi issue would not exist.
With all that said, really, go download and try the FXR fix. It works, it really does.

HTC U11 dual sim phone WiFi No longer connects After Android Pie Update

Hi
My phone upgraded to Pie 2 days ago and since the update my WiFi no longer connects. My phone can see the various networks and when I try to connect it is like it is stuck in an authentication loop and acts like the password is incorrect. I have entered the password multiple times and even changed it too. It sits in the saved networks but will not connect. I even fiddled with the WiFi turns on automatically settings and it still doesn't work. I have tried everything even factory resetting my phone, which has been a nightmare because I lost a heap of 2FA codes with my authenticator. I have reset my router, changed SSIDs, passwords etc. Basically everything I can think of I have done. I have raised the issue with HTC and they have asked me to do what I have already done but in the meantime, while I await a response from them for my next course of action, I am wondering if any of you guys know of any issues where the WiFi doesn't work anymore. I am currently using the internet on my mobile network but I will probably burn through the data before the month is out so I am really keen to get my WiFi working again as it's going to cost me a fortune otherwise.
Thanks in advance for any responses that I may receive
Solved
Ok I fixed it. It was a weird solution all I had to do was disable my password on my network and it connected fine. I then re-enabled my network password and entered the password on my phone and it worked. This was such a frustrating issue and I don't know why it wouldn't work before. I went through some pretty drastic measures to sort it, but now I know for next time to try this. I hope this helps anyone else out with a similar issue

Galaxy Express 3 (J120A) Not Connecting to WiFi - Cycles Between "Connecting" and SSID Not Appearing

I bought a Galaxy Express 3 (sm-j120a) on Ebay (new condition) to use as a backup phone. I began the setup process and tried connecting to my WiFi. I put in the correct password but it will constantly cycle between showing "Connecting" underneath the SSID, then suddenly the SSID disappears, then suddenly it will reappear and show "Connecting" underneath, etc. It will do this indefinitely and will never connect. If anyone has experienced this issue before and knows how to fix it, I would greatly appreciate some help.
One thing I haven't checked is whether I could update the software of the phone to the last available update. I wanted to hold off on putting in my sim card because I have a nano sim and I think the phone takes a micro sim and I don't have an adapter yet. Is there a way I can download any available updates to my computer, then send the update to the phone via a USB cable?
Thanks!
i ran into the same thing a while back with an old android phone, a samsung j120a. one day its wifi stopped working with the att modem i have, a bgw210. behavior was the same as what you described. every other wifi device in the house worked fine. tried every standard trouble shooting thing you find when you search this, including factory data reset, nothing. got hold of another phone same model... it also failed to connect to wifi on this modem, same thing.
the answer-> i resorted to playing with the wifi settings on modem, and found that the problem was with the wpa version setting- it was set to wpa 2 by default when i found it. i changed it to the setting that accepted both versions 1 and 2, and the phone's wifi now works again.
i assume at some point att updated this modem, and one of the updates was to change default setting on the wpa version, probably because wpa 2 is supposed to be more secure than wpa 1
just replying because i hate searching stuff like this and finding nothing but people asking roughly the same question without getting any answers. hope this helps somebody searching this in future

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