Galaxy A8 2018...twas a great phone... but now the LTE radios are cooked... they aren't working at all. - Samsung Galaxy A8 (2018) Questions & Answers

has anyone heard of this? I'm not sure why this is or if there is even a fix.
throwing a compat sim card in and I get failed connects, to which it goes down to "UMTS/HSPA/4G" and weaker speeds. if I turn off the "auto LTE" connect it works just fine.
I've noticed this for awhile but finally became aware of it now. my phone is rooted on Oreo but I like it this way- Oreo is awesome and the experience was smooth and battery has been great (replaced last year) and my only real issue until now as a "weaker then S7" camera that was serviceable during the day. what the hell happened? anything I can do? resetting the networks just doesn't do it.
8 Mpbs down 1 up for reference IN a city area where connection speeds are good.....pretty bad..passable but bad

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Fed up with 3G/HSPDA Issues!

I have been having some really annoying issues with the 3G capabilities of the Touch Cruise. I actually think it is something AT&T is doing on the network, but can't be sure. Anyone experience anything like this? Here are the symptoms:
1. The TC worked great on the 3G network when I first received it. Averaged around 700k speeds.
2. I flew across the state and the phone was unable to make or receive calls. I noticed the 3G/H symbol just fine, but no voice, no data. On a whim, I turned off the 3G and went back to Edge and everything worked fine, slower - but fine. I noticed this behavior on several subsequent trips. Coverage maps show 3G capability.
3. I've been to numerous other cities and experience varying 3G speeds, but the phone definitely works.
4. Lately I've noticed the phone almost seems to experience 3G "fatigue" by the end of the work day. In my home area where it seems to work fine, I'll look at my phone and it will either have no service, or it will not be working on 3G (no calls or e-mail). By later in the evening, it appears to be back to normal.
5. A reset will normally bring things back at least temporarily.
6. I have been trying out new ROM's and Radios posted here, but don't think they are the source of the issues. I've upgraded and downgraded with the same results.
Is this the AT&T network? Could it be with the proliferation of 3G devices, the network becomes saturated particularly by the end of the day?
More importantly, if 3G is for some reason unavailable the phone should degrade gracefully enough to allow it to continue to operate on the Edge network without any interaction by the end user.
Anybody else experiencing this behavior? Any tips? Any resolutions?
Re:
You could try to fix the GSM and 3g bands in the phone settings from automatic to your specific band. Normally that reduces ur battery usage and provides better network clarity. It might just help.
Secondly you could try the SEA 6.1 official rom as that seems to be one of the best ones so far.
I had plenty of 3G / Edge issues when i first received my TC. I spent many hours with AT&T tech support as well as a few conferrence calls with AT&T and HTC. No one was able to come up with a viable solution. Being a geek at heart I spent many hours testing roms and radios. Only a few combinations work with the AT&T edge network. My ROM is based on 18129.0.4.5 with a murata radio 1.58.21.23(must be certified murata) and has worked for me with no problems.
Hope this helps

cell signal issues with vzn tp2

Is anyone having cell signal issues? I moved from a moto q9 napoleon and never had any signal issues; i.e.alway getting evdo signal while in my home, but now with the tp2, i spend most of my time with a 1x signal. And this (1x signal) negatively impacts my battery life.
The better question - is there a fix or solution?
Thanks
John
I have noticed the same thing with my phone. Only had it for 2 days. It gets 3G until I turn into my drive and then it goes to 1x. I had a Treo 700WX on Alltel and always got EVDO. Verizon and Alltel are sharing the same tower. The TP2 has been getting 3G at a lot of other locations that I have tried. I did notice that I was getting no signal lines at home, but when I made a call, it went to 2 lines. I wonder if it is a power saving thing, but I guess the 1x isn't helping the power.
Terrible problems with 1st TP2
The first one Verizon sent me had terrible problems with the radio. Iffy to connect to a call and even though it said 3G could hardly ever connect to broadband. Kept getting irritating popup telling me it could not connect to #777. The replacement they sent is working great here in Ft Wayne. I will update when I get back out on the road and see how it does roaming. I suspect a few may have just been defective since everything about this new unit is better.
As a side note, if anyone knows which registry key can get rid of those stupid popups, I would be grateful since I can't seem to find directions anywhere. I really don't need constant reminders after I hit dismiss the 1st time.
i've been having horrible battery life as well - and received the #777 problem as well yesterday. i thought it was a network issue or some software that caused the problem. i guess it isn't, though it seems to be working fine now? anybody else see this error?
i'm coming from AT&T so it's hard to get worse reception than that.. will see if it is as good as my last verizon phone however.

4G LTE Data Connection "Stall"

So I have a perfectly good 4G LTE signal going, data speeds are great and all, but every once in a while it will just stop receiving data. The 4G LTE icon is still there, occasionally I see the upstream arrow flash, but the downstream arrow remains blank. A difference that I see from other people's connectivity issues is that I never once see it switch to 3G/1X when this happens.
One thing to note is that this behavior is not readily apparent until you're doing something real-time network dependent, like streaming audio/video for a considerable duration of time until it cuts you off suddenly.
Between 10 seconds to several minutes after data stops transmitting, it starts working again. Sometimes I get impatient and just toggle between CDMA only/LTE automatic to get 4G LTE working again without having to wait.
Is this a common issue among Charge owners? I noticed the reviewer at Anandtech had a near identical experience (though not always fixable without a reboot for him):
"My only complaint is that every once in a while, the LTE data session sometimes stalls briefly – sometimes for a a few seconds, other times for a few minutes. When that happens, you’ll see the uplink green arrow blink, but no orange downlink arrow. Rebooting the device fixes things."
Click to expand...
Click to collapse
After conversing a bit with him (he also reviewed the Thunderbolt/Revolution), this apparently only happens with the Charge, but he also has faith that Samsung would fix this through software (RIL) or hardware (firmware). Given Samsung's track record with smartphone updates, I'm not so sure they will.
PeterDLai said:
Given Samsung's track record with smartphone updates, I'm not so sure they will.
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Click to collapse
Considering a month after the phone's launch we already have a Gingerbread leak I think this device will most definitely see support from Samsung. It is a DROID branded phone after all, and Verizon is statistically the best carrier for updates, they do take special care of the "DROID" phones over every other Android handset.
4G is flakey, on both devices that offer it. I have both the Thunderbolt and Charge with me most of the time, and I see all kinds of flakiness on both. It's the network.
It is definitely the network. I had a Thunderbolt before the Charge and it was FAR worse with network connectivity falling off the face of the planet despite having full 3g/4g.
Sent from my SCH-I510 using Tapatalk
I have had the same problem. I usually wait and it comes back in about 30-45 seconds, but it is annoying. It was really bad for a couple of days but has been better the past couple.
I personally haven't had to much issue with 4g dropping out. However people need to keep in mind that LTE is new for both the mfgs & carrier. So it is going to take time to get all these bugs worked out. That said I have to give props to VZW and the mfgs tho because back when they were building out 3G originally you want to talk about issues my lord was it bad.
I have had this issue, with the 3G and the 4G, but I can't say that it's a deal breaker for me, compared to the lousy HSPA+ signal my Vibrant had. It's only ever happened to me at my house, which is right on the edge of LTE coverage, so it switches back and forth a lot. But I have to give the network the benefit of the doubt for right now, it's a brand new network and a brand new device. And the 97% of the time that things work properly, it's so far above and beyond the T-Mobile network I have no regrets about switching.
I called Verizon with the same issue last Friday. Their resolution after a couple of questions was to overnight me a new (certified like-new) Charge and SIM card - the replacement was received on Monday. I haven't had any issues since, but I also stopped seeing the issue after I made the complaint.
Regardless, replacement has been better and locks a GPS signal much quicker. Maybe it's the SIM card?
SAME CRAP HERE!!!!
Sent from my SCH-I510 using XDA App
I tested if I have this behavior using LTE only mode (dial **583 in Phone app) and indeed I do, so this furthers my belief that my issue is not due to something wrong in the hand-off between 4G/3G.
I found out the way to actually change the data modes and tested using EV-DO Rev. A instead of eHRPD (in conjunction with LTE) and also using just CDMA 1X (in conjunction with LTE, essentially disabling 3G), but my issue of dropping data exists. The 4G LTE icon is displayed the entire time when it happens, I just seem to lose connectivity (and all three of the tests in the Phone Info area fail) temporarily. For what it's worth, I'm not moving the phone around at all when this happens.
I think I would actually be more content if when the data connection stalled, my 4G LTE icon just disappeared or if it switched to 3G because then it would make more sense to me (that I may have lost connection to the 4G service and it's attempting to reconnect to either 3G or 4G), but as it stands, all I get is a constant 4G icon with intermittent dropouts. The switch to 3G/1X seems to be the more common issue among 4G smartphone owners, but my (and the reviewer at Anandtech's) issue seems to deal completely within the 4G network, and I've tried every leaked radio to no avail.
The regularity of the dropouts seems kind of random as well; I'm not sure how I can figure out the source of the issue. Does anyone know if there are some logs that I can look into to see if something is happening to my phone at the very instant that I'm having these stalls?
Of course, I'm not discounting the fact that it might completely be on the side of Verizon's network and/or my area in San Diego and has nothing to do with my phone, and I may in a minority of users that actually continuously uses the 4G enough to notice these dropouts, which on average happen once every half hour to hour or so. Sometimes I'm able to stream something for several hours without the stalls, and other times it'll happen frequently within a short time span.
I just got off the phone with tech support for the intermittent data drop problem. After confirming that I was on EE4, and that I had tried doing a factory reset, he is fedexing me a new sim card.
Really hope it works, I love the phone but losing data for 1-2 minutes at a time randomly is pretty lame. Especially since I switched to Verizon for their reputation as the better network.
Racer447 said:
I just got off the phone with tech support for the intermittent data drop problem. After confirming that I was on EE4, and that I had tried doing a factory reset, he is fedexing me a new sim card.
Really hope it works, I love the phone but losing data for 1-2 minutes at a time randomly is pretty lame. Especially since I switched to Verizon for their reputation as the better network.
Click to expand...
Click to collapse
Is your problem the same as mine (data drops all while 4G icon is displayed) or is yours the more common 4G to 3G/1X transition or losing the 4G network icon data drop?
PeterDLai said:
Is your problem the same as mine (data drops all while 4G icon is displayed) or is yours the more common 4G to 3G/1X transition or losing the 4G network icon data drop?
Click to expand...
Click to collapse
The data will stop. Then the 4g or 3g icon will disappear entirely for a minute. Then it will reconnect at either 4g,3g or 1x, I don't really see a clear pattern, it seems totally random to me.
Is there anyone who's reading this that regularly uses their 4G continuously (i.e. hours) for streaming web content (e.g. radio streams, live video streams, etc.)? If so, do you experience any occasional dropouts or is the 4G connection for you rock solid?
Racer447 said:
The data will stop. Then the 4g or 3g icon will disappear entirely for a minute. Then it will reconnect at either 4g,3g or 1x, I don't really see a clear pattern, it seems totally random to me.
Click to expand...
Click to collapse
hey, I have exactly the same problem!
same here,lose 4g icon when i use either the mobile hotspot or the tethering option.longest i have been connected was about 15 minutes.
fender22 said:
same here,lose 4g icon when i use either the mobile hotspot or the tethering option.longest i have been connected was about 15 minutes.
Click to expand...
Click to collapse
Tested on mine and same result.
Edit: Rebooted and it works fine been on it 20+ now, I'll be testing some more
A couple of days ago my SIM card crapped out.
Now that i have a new one my 4G signal has been more consistent and stronger than ever. I live in a fringe area and before the new SIM it would constantly switch between 4 and 3G. Now i go for hours on 4G and it even stays on 4G in places that it would always switch and stay on 3G.
Get a new SIM before getting a new phone.
Sent from my Samsung Droid Charge: Stock EE4
After reading this thread I'm considering switching to either the Thunderbolt or the Revolution, or something else when it comes out...
Anyway, I have experienced this same thing.
The only difference in my situation is that I'm trying to use my LTE internet as a dedicated connection. The setup I'm trying to do is plug my phone into my router and have the router distribute the verizon LTE internet through my apartment. My router currently has the latest version of tomato installed and I compiled my own RNDIS module (modified to work with the charge). Everything works for the first few minutes (15-20), then I notice the 4G icon "stall", then disappear, then reconnect. After the first disconnect and reconnect, the internet connection is very unstable and will disconnect every couple of minutes until I disable and re-enable the internet again... very frustrating.
In the interim, I've been using EasyTether and this works very well. I have streamed hours of 720P video and it works flawless; not one skip or reconnect.
This leads me to believe that it is either one of the following:
The kernel - I'm currently using the PBJT kernel found in the latest version of humble. I'm not sure if the stock rom will provide better stability.
The radio - I currently have the EE4 radio installed, but am very curious to know the stability of the GB radio updates (EP1f, etc.).
Any other ideas would be greatly appreciated!
Thanks!

HTC One S Signal Fix?

I have an unlocked HTC One S that has major signal issues. When the phone boots, there's no service for a few minutes before it decides to actually kick in. WiFi and everything seemed to not work but after putting it into "Best Wi-Fi Performance" mode it seems have resolved. But the cellular signal drops constantly. I've read that this is quite the common issue with these phones and am wondering how they are so popular if this is the case. Regardless, has anyone discovered the reason for the issue or some sort of jimmy rig to fix this issue?
Phenomin said:
I have an unlocked HTC One S that has major signal issues. When the phone boots, there's no service for a few minutes before it decides to actually kick in. WiFi and everything seemed to not work but after putting it into "Best Wi-Fi Performance" mode it seems have resolved. But the cellular signal drops constantly. I've read that this is quite the common issue with these phones and am wondering how they are so popular if this is the case. Regardless, has anyone discovered the reason for the issue or some sort of jimmy rig to fix this issue?
Click to expand...
Click to collapse
please mention your hboot , radio , Rom.
I'm having a similar problem. Occasionally I get a signal strength of 2 billion dBm. (255 asu)
What seems to be alleviating a lot of it is a set of mods to build.prop.
ro.ril.fast.dormance.rule=1
ro.ril.gprsclass=1
ro.ril.hsdpa.category=1
ro.ril.hsupa.category=1
ro.ril.hsxpa=2
These settings are the absolute slowest possible, but they do seem to be improving the connection quality.
Same problem to me. I have a new S4 from 2 days, bought "refurbished" from aliexpress at a good price. It's new, looks great but signal and in call audio quality is weak.
Phone works good on "GSM only". If i set GSM/WCDMA, I lose signal and phone stops itself.
I started with stock 4.0.3, phone stops itself.
Updated to 4.0.4, phone doesn't stop but no signal with WCDMA enabled.
Then I unkocked, rooted and tried Miui V5 (4.1), same problems.
After installing Maximus HD, I had signal also with GSM/WCDMA, but immediately I installed newer firmware and signal was lost. (Works only on "GSM only").
Tried also Beanstalk, CM11, MagioRom, SourcE, Slim kat. No signal with GSM/WCDMA.
I don't know if works with Maximus with older firmware, or it was only a coincidence. Don't know what firmware was at that moment.
Went to a bigger city and 3g worked excellent.
Returned back to home, no signal with 3g enabled.
I guess my phone is weak at signal.

Question Pixel 7 Pro losing cellular connection and unable to reconnect

I live in Boston metro area with abundant LTE/5G coverage, but drive through two nearly dead zones, each of them lasts just a few seconds. My previous phone would not stop YouTube playback going through those areas. My Pixel 7 Pro loses connection for ~5 minutes completely and then reconnects via EDGE even though strong 5G is available. I have to toggle the airplane mode for it to connect to the correct network.
I'm on Mint/T-Mobile and this has been happening every day. Is it a software bug or is my Pixel defective? Thanks for any ideas, I still have a week to decide if I should return it
I used to have this same exact issue with my pixel 6 pro and wouldn't be fixed no matter what I did. I traded it in for my p7p and haven't had that issue since. You should replace it while you can and hopefully it won't happen again
I have the same problem. Whenever there's a slight interruption of service the Pixel can't reconnect for minutes. I have to enable and disable airplane mode a couple times.
Bonus, if I just leave it it disconnects from the network randomly. I miss A LOT of calls. And people tell me that the calls take a long time to connect either way.
I'll be returning it if it doesn't get an update in a week or so.
domi_niku said:
I live in Boston metro area with abundant LTE/5G coverage, but drive through two nearly dead zones, each of them lasts just a few seconds. My previous phone would not stop YouTube playback going through those areas. My Pixel 7 Pro loses connection for ~5 minutes completely and then reconnects via EDGE even though strong 5G is available. I have to toggle the airplane mode for it to connect to the correct network.
I'm on Mint/T-Mobile and this has been happening every day. Is it a software bug or is my Pixel defective? Thanks for any ideas, I still have a week to decide if I should return it
Click to expand...
Click to collapse
I don't know if this will help, but...
I believe EDGE uses 2G. Maybe turn off "Allow 2G" in Settings>Network & internet>Sims>Allow 2G. Hopefully this will stop it from connecting to EDGE and instead connect back to your strong 5G or LTE.
Thanks, I'll give it a shot.
It still takes a long time before it connects to the 2G network and all I see is an exclamation mark next to zero bars.
If you have taken the .031 update, which fixed that issue for me, then it's possible you may have a defective unit. I have had zero issues with signal handoff and I'm even taxing the modem even more by running dual SIM in DSDS mode. I have been incredibly happy with this device's reception. I would even say it's been better than my OnePlus 9 with the X60 modem as 5G standby drained my battery super fast, about 1.6%/hr in a high signal area, compared to half that on my 7 Pro with dual SIM active.
The system is up to date. Not sure what else I can do. I'm not interested in installing unstable nightly updates.
EtherealRemnant said:
If you have taken the .031 update, which fixed that issue for me, then it's possible you may have a defective unit. I have had zero issues with signal handoff and I'm even taxing the modem even more by running dual SIM in DSDS mode. I have been incredibly happy with this device's reception. I would even say it's been better than my OnePlus 9 with the X60 modem as 5G standby drained my battery super fast, about 1.6%/hr in a high signal area, compared to half that on my 7 Pro with dual SIM active.
Click to expand...
Click to collapse
What's this update you're talking about?
z3nith66 said:
What's this update you're talking about?
Click to expand...
Click to collapse
I got my phone on release day and there was an update waiting to go to TD1A.220804.031. Until I took that update I was seeing that ! every 10 minutes or so. It was pretty bad. Haven't seen it since unless I'm switching my SIMs around.
EtherealRemnant said:
I got my phone on release day and there was an update waiting to go to TD1A.220804.031. Until I took that update I was seeing that ! every 10 minutes or so. It was pretty bad. Haven't seen it since unless I'm switching my SIMs around.
Click to expand...
Click to collapse
Oh I'm on the beta as Android Auto wouldn't work on that one. It got better after I reset Carrier Services but it still has issues.
I'm losing calls, they just don't connect, even on 4G LTE with full bars. A friend has the same thing. These things are not ok.
z3nith66 said:
Oh I'm on the beta as Android Auto wouldn't work on that one. It got better after I reset Carrier Services but it still has issues.
I'm losing calls, they just don't connect, even on 4G LTE with full bars. A friend has the same thing. These things are not ok.
Click to expand...
Click to collapse
I'm on the beta as well and still having no connectivity problems so I guess I should consider myself lucky. The worst I have is some outsized drain when I have a weak signal but it's still not terrible (about 2.2%/hr in my partner's basement).
EtherealRemnant said:
I got my phone on release day and there was an update waiting to go to TD1A.220804.031. Until I took that update I was seeing that ! every 10 minutes or so. It was pretty bad. Haven't seen it since unless I'm switching my SIMs around.
Click to expand...
Click to collapse
This issue happens to me from time to time too. Weird but mine shipped with .031 (picked up on 10/21 at best buy). But I guess it was worse before that.
Were you able to fix this? I have the same issue, the phone is just unusable. Such a shame as I really like the device...
I came from a OnePlus 8 Pro (what a great phone BTW), and found the Pixel 6 Pro had worse connectivity. The Pixel 7 Pro seems to have fixed all that and some bluetooth issues I was having with certain headsets on the Pixel 6 Pro.
One trick on any modern 5G phone -- if you are having issues -- the switching between 5G, 5G UC, and LTE can be disruptive. If this is constantly happening just switch it to LTE, chances are you'll get better reception and at the same or even faster speeds.
For example, a Six Flags a few weeks ago, 5G was constant problems while forcing LTE worked fine 100% of the time.
I've tried switching off 5g, switching off 2g, switched off adaptive connectivity...no results, still useless
zsguerreiro said:
I've tried switching off 5g, switching off 2g, switched off adaptive connectivity...no results, still useless
Click to expand...
Click to collapse
How about your APN settings? Have you tried a network reset? If none of those things helps you may have a defective phone! It can happen with any brand.
jaseman said:
How about your APN settings? Have you tried a network reset? If none of those things helps you may have a defective phone! It can happen with any brand.
Click to expand...
Click to collapse
Yes, tried resetting the APN as well, also swapped esim and sim to another phone and works flawlessly...it may be a defective unit but there are many users complaining so there has to be a lot of defective units...
zsguerreiro said:
Yes, tried resetting the APN as well, also swapped esim and sim to another phone and works flawlessly...it may be a defective unit but there are many users complaining so there has to be a lot of defective units...
Click to expand...
Click to collapse
Well, I am not using an esim with a psim. Only a psim here and running on Mint (T-Mobile) and I have zero issues. Either some setting, or conflicting network settings between the two sims...OR a defective phone is your issue. I would bet dimes-to-dollars that it is NOT the phone. YMMV
Hmm happy to see i am not alone...... I have already post on this forum for this same pb.
I am full 4G....i try to make a call, instantly when i push call button, lose connection....must wait and maybe 4G and more in EDGE.
When i am in 4G impossible to call or receive....
So i have a phone with impossible to call or receive.......
SO NICE ????
For me, i am sure is the last F/W (31) who suck.
Why ?
Because, my phone work, after upate (31) just after reboot must wait 7 min to have network...never before....
SO last week end, i will downgrade to first F/W (A2)
Problem is solved for me.
I have locked all automatic update in developper menu.
Sometimes i have notification for update, but i don't care..........
Incredible but work for me, i think you must try...i don't see another solution for this ****ing problem
I had use the official tool : https://flash.android.com/
Sounds like a work around, how do you downgrade?

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