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[Not-Fixed] How to install new Z3 D6603 LTE on AT&T network

[Not Fixed] see bottom of this post.
It is fairly easy to install a new D6603 to work completly on the AT&T network. It is not so easy to find the answer of how to do it in the threads and posts. I tried many suggestions and wasted a lot of time. Hopefully this will save you from that fate.
First you must know that you can't use the IMEI number of your new phone if you want it to work completly as it should. If you use the Z3 IMEI you will have trouble with data of various sorts and the phone will go off line when on LTE after 20 or 30 minutes and you will not receive calls or SMS messages. I do not know why but it has been suggested that the AT&T network does not recognise this phone so it causes trouble.
If you have an AT&T nano-sim from your old phone then just put it in the phone. (Cut downs work but can cause other problems some say.) When the SIM is inserted for the first time into a new phone there is a prompt that asks if you want to download the APN. Hit 'yes' and the phone downloads the APN itself.
If it does not ask then go to Settings>More>Mobile Networks>Prefered Network Type and be sure LTE (Preferred) is selected. Then connect your phone to the internet and then go to Settings>More>Internet Settings and select AT&T. You should be good to go.
If you need to get a nano-sim then go to the AT&T store or call and they will give you one or send you one for free. You will need to use the IMEI number from a LTE phone that is already on the AT&T system. You can use your old phone or borrow the number from someone. If the rep installs the sim in the Z3 with the 6603 IMEI don't worry. Just call support later and tell them you sent your new phone back and want to go back to your old IMEI or have a new IMEI (from an existing AT&T phone). They will enter it and off you go. The phone from the IMEI will show in the picture on your account page. Big deal!
Update: This worked for hours last night but this morning it is back to not receiving calls. Simply turning wifi off and it began to receive calls as GPRS was switched back on. My wifi was on which has been said to cause problems. I will test with wifi off and report back. Had "no service" instead of AT&T on upper left of lock screen. A full shut down for several minutes than re-boot solved that.

YMMV. I've been on ATT with a Z3 purchased from Sony store for several months and it was registered in an ATT store by scanning the IMEI off the box followed by updating Internet settings in Setup. ATT online shows unknown model but everything works including LTE and MMS. There is something else involved when problems like this occur probably some setting not getting reset. I registered the Z3 on a new line with a new Sim card because I wanted to take my time moving stuff off my old phone--this may have avoided the problems.

JudH said:
YMMV. I've been on ATT with a Z3 purchased from Sony store for several months and it was registered in an ATT store by scanning the IMEI off the box followed by updating Internet settings in Setup. ATT online shows unknown model but everything works including LTE and MMS. There is something else involved when problems like this occur probably some setting not getting reset. I registered the Z3 on a new line with a new Sim card because I wanted to take my time moving stuff off my old phone--this may have avoided the problems.
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I've also had no problems with my Z3 on AT&T. Works great, receives sms/mms immediately, etc..

esheesle said:
I've also had no problems with my Z3 on AT&T. Works great, receives sms/mms immediately, etc..
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AT&T's system sometimes takes a while to get updated with new IMEIs that trigger LTE provisioning for a users' account.
Once your account is provisioned for LTE you never have to worry about it again, but sometimes if you have a phone the system doesn't recognize, it is a pain to get AT&T to properly provision your account. Supposedly properly trained in-store reps can do it - the key being "properly trained" - Never try to do anything "unusual" by calling AT&T customer service, and NEVER use a franchise/kiosk in-person for service - make sure you're at a corporate-owned store! Even then, some stores might have incompetent staff. I've been lucky that all of my local corporate stores are pretty well staffed.

So you are saying that your Z3's with wifi and LTE on with AT&T are working as they should?
With LTE off my phone responds normally with wifi on. With LTE and wifi on it will not respond to calls after a 30 minute sleep. It does not show missed calls. Calls go straight to voice mail after 2 rings. Could you tell me what level your LTE dBm's are? Thanks!

I was told not to give them my imie# but, after recvng the minisim I had to call them in order to 'provision' it to work at all and they needed that #. I have never had any problems personally and am assuming this may be because you gave them the wrong #. Again I am only guessing. Oth, if I had had a different imie to give, I would have done so myself.

It is very strange and I am feeling it is more signal strength related than how you provision your phone. (Once it is provisioned correctly.) It seems that more people have less problems when they already have a nano-sim and just plunk it in the new phone. This might indicate that they already had a strong signal from the get go. My old HTC One + get's a better signal than the Sony in the same locations with the same (new) SIM. With the Devilcase bumper on it gets 5% less. My very limited tests yesterday seemed to indicate that it was signal strength related. I am not enough of a conspiracy theorist to imagine that AT&T would program their system to not function correctly with sims that are provisioned with these Sony phones which they are obviously ignoring for some reason. Or am I?

I had all kinds of problems with the Z3 on AT&T. The IMEI caused an issue since AT&T linked it to a flip phone and therefore couldn't provision LTE. I changed it to an old AT&T LTE device and then I was able to get LTE but was having the same issue with calls going directly to voicemail and texts showing up hours later in bunches. I found the solution was to switch off LTE in the quick settings menu. All calls and texts came through and on time while LTE was off. If I needed a data boost to stream, I turned it back on until I was finished streaming. This was while on KitKat. After upgrading to Lollipop, I was able to keep LTE turned on and calls and texts still arrived on time.

I use data rarely. Mostly wifi. If I don't leave LTE on, my phone reverts to wcdma preferred. And why can't LTE just work without me having to constantly turn it back on? What bugs me is having the APN settings greyed out. I want to be able to turn it off. If anything it seems the phone itself is preventing me from accessing the sim. It feels like I'm borrowing something which contains lots of MY private data. I know my phonebook is stored locally but I also noticed there is no option of specifying the sim or not. Anybody know how to switch APN on and off? In fact, overall even rooted, I still feel like I have almost no power over it. I can't even disable the cellular connection without going full on airplane mode and I do not trust that. I don't even fly so that needs work for sure. Dumb question but could I buy a working nanosim from say 7-eleven that my apn switch will work with?

"Anybody know how to switch APN on and off?"
On my Z3 on OTA stock Lollypop I have an icon in quick settings to turn LTE on and off. Drag two fingers down from the top of the screen. If no LTE icon then select the pencil icon at the top and select the LTE icon. There is also a mobile data icon switch there.
To turn off your radio completly you can get the Advanced Signal Status app and select additional info at the bottom and click phone information and turn off radio. Probably a number of ways to do it but that is one.
Sim contact storage was a way to move information from phone to phone. You can still do it but not really necessary with cloud backup and storage. Google does it for me without me having to do anything which I like. I still save contacts to the sim just because I can. Export and import in your contacts app menu.

johnboatcat said:
So you are saying that your Z3's with wifi and LTE on with AT&T are working as they should?
With LTE off my phone responds normally with wifi on. With LTE and wifi on it will not respond to calls after a 30 minute sleep. It does not show missed calls. Calls go straight to voice mail after 2 rings. Could you tell me what level your LTE dBm's are? Thanks!
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Works fine here. I don't pay attention to the dBm estimates since these aren't measured with calibrated test equipment and vary widely. Those numbers are basically worthless.
The only valid comparison is data performance in a given environment (ideally a difficult weak-signal one) - and at my desk with very weak signal, every phone I've ever used performs similarly to the Z3.

"Those numbers are basically worthless."
True, but we have narrowed this down to the possibility that it might be signal related so it is worth a shot. If people whose phones are working fine would measure the LTE dBm on Advanced Signal Status at the location where their phone sits and works well the most we might possibly see some measure of difference in the phones that are not working. Most of the non-working phones seem to work sometimes so signal strength is the next best parameter to rule out. Thanks!
Here are the screen shots of my phone with LTE on, LTE and wi-fi and LTE off and wi-fi.
How do the working phones compare? Does your CDMA (voice) also go to 0% when LTE is on and GSM = n/a?

Thanks. I think adv sig nfo actually works. I'm amazed actually. I can't find the phone's native greyed out apn switch anyways which really makes no sense.

Phone always shows roaming after MM update

Hello,
today I updated to Marshmallow MT7-L09C432B571 and since that update my phone constantly displays it requires roaming. I'm in my usual network which I'm having a dataplan in. I also checked my apn profile, and it's alright. The data works, but only if I enable roaming. I'd rather avoid using that option, so it'd be great to know how to get mobile data without having to activate roaming all the time, especially because I live close to my countries border and my network might change and get me additional costs.
thanks in advance.

Can't turn on data using the Verizon G5 on AT&T?

I just bought a used Verizon LG G5 (VS987), however my carrier is AT&T. After putting in the Sim card, calling and texting works but when I go to turn on mobile data in the settings, I get a popup that says "Add Mobile Service Please contact Customer Service at (800) 922-0204 for assistance."
I have called both that customer service number for Verizon ^ and also AT&T. I made sure that my IMEI was updated on our AT&T plan, and I have the right APN settings put in. When I called Verizon, the guy didn't really have much to say except that the device is unlocked but full access to features can't be guaranteed, and I am aware that Verizon and AT&T use different wireless bands, which he explained, but I should be able to at least have some kind of data. We both agreed that this is just some piece of Verizon software keeping me from using data, and he suggested rooting the phone to get a workaround.
One suggestion that I saw in some forums and tried was that resetting the network settings in Backup and Reset does turn mobile data on by default, however I get the same Verizon popup as soon as I open any browser, and other apps just say there is no connection, although when I do this I can see that I am getting either HSPA or 4G data, it just seems like it's being blocked by this Verizon stuff. Messing around with other setttings such as Data roaming and System select didn't change anything.
Does anyone have any experience using a Verizon G5 on AT&T? I saw a video of someone demoing T-Mobile 4G data on the Verizon model, and another user on XDA said that he put in his T-Mobile sim and it worked perfectly. My best guess on where to go from here is to unlock and root, and see if I can install a custom rom to get around this. Does anyone know if there is a stock LG rom without all of the Verizon bloatware installed, maybe a stock rom for the unlocked model of the G5? Any suggestions on how to get this to work are appreciated, and I think this is posted in the right place, I'm an active reader on XDA but this is one of my first posts
Thanks to anyone that reads all of this!

Update: I reset the phone to factory settings and set it up with the sim card from AT&T in it. Since then I can turn on mobile data, and the notification bar shows I have data (mostly HSPA), however I have no connection when I try to load a webpage. Tomorrow morning i'll stop by the AT&T store and see if there's anything they can do.

jayscoottey said:
Update: I reset the phone to factory settings and set it up with the sim card from AT&T in it. Since then I can turn on mobile data, and the notification bar shows I have data (mostly HSPA), however I have no connection when I try to load a webpage. Tomorrow morning i'll stop by the AT&T store and see if there's anything they can do.
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Did you add the correct APNs for AT&T in the phone when you put in your sim? you need it for internet and MMS
Did you which it to Gobal or other option that is not LTE/CDMA?

Same problem here
jayscoottey said:
Update: I reset the phone to factory settings and set it up with the sim card from AT&T in it. Since then I can turn on mobile data, and the notification bar shows I have data (mostly HSPA), however I have no connection when I try to load a webpage. Tomorrow morning i'll stop by the AT&T store and see if there's anything they can do.
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Was your problem solved? I'm having the same problem with another Verizon LG Device. If it was solved, what did you do?

Is there any way to make IMS settings permanent or stop Android from auto discovering IMS settings on boot?

So, I've got a Galaxy S10e, with a model number G970U1, and the entire reason I bought this thing was so that I could use voice over LTE on AT&Ts network - it was one of the model numbers listed that was supported by AT&T, however, the phone itself, while being brand new, was originally a Verizon phone, as the phones CSC states that it is XAA/XAA/VZW. Upon insertion of my ATT sim card, the phone did not adapt to being an ATT CSC, even though it has the OYM software that should have the ATT CSC in it. I have tried a ton of things to try to get it to switch CSCs, from flashing an ATT CSC in Odin, to just doing resets with and without the sim card in, to literally paying $35 for Samkey to try their CSC changer, but simply doesn't work. nothing I do will get this thing to switch to the ATT CSC.
Anyways, as a consequence of not running the ATT CSC, VoLTE does not work. ATT has already provisioned the phone for VoLTE but the phone simply doesn't automatically acquire an IMS registration upon boot. I've discovered after many hours of trial and error, a way to make VoLTE work, but I can't find a way to make the fix stick between boots. This is where I'm hoping somebody else can come in and help. I'm looking to try to get the phone to stop automatically discovering IMS settings since I think it's this very auto discovery that is causing my fix not to stick.
Here is what I have to do every time the phone reboots to get volte working:
Open Alliance Shield X, go to App Manager
Search for IMS settings, click it, go to activities, and then launch the IMS settings menu with the first activity in the list.
Go to the IMS service settings, upon clicking of the IMS service settings, ALL of the toggles for RCS and MMTEL will be off and the upper left corner says "ATT US" - I toggle all of the toggles on and wait about 10 seconds
Go to settings, about, sim card status, and at this point my IMS registration status should have gone from not registered, to registered, however, VoLTE still doesn't work at this point.
Switch back to the IMS settings menu, go back a page and then click "Reset to default" to reset all IMS settings to default. Here is where things get strange - at this point, the IMS settings menu will claim I am using the T-Mobile IMS settings - but at this point my IMS registration status will remain registered, and VoLTE will work properly until I restart the phone.
I want to try to keep these settings, but like I said, once I reboot the phone, it gets the ATT IMS settings and VoLTE will refuse to work, and my IMS will not be registered.
Any advice?

PhotonDispenser said:
... Any advice?
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Do you absolutely HAVE to have ATT? You would likely get better results with T-mobile.

MrGoodtunes said:
Do you absolutely HAVE to have ATT? You would likely get better results with T-mobile.
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Not necessarily, but the issue is that I've got 6 lines on AT&T, with some of the phones not being paid for.

You might try this method. Download the Latest same firm tool. Hit this tool is basically used for removing the FRP lock on phones, and it actually does work for that, but one other feature the program has is the ability to change the CSC code on your firmware. Which it did successfully, until the phone was rebooted and then it locked back on to AT&t. So the trick I think would be that after you use the tool and before you reboot the phone do whatever you're going to do because it you can change it to xas or xaa in which case it's unlocked and you should be able to manipulate it. I have never actually done this but in theory I think it might work good luck brother keep fighting the good fight

volte missing in Samsung s8

I do not have very good reception where I am, so I started looking for things to help. Got a booster which wasn't much help. I then thought voice over wifi, so I checked if the s8 had it and yes it does, or so I thought. Voice over WiFi did not appear anywhere in my settings, my Telus provider was baffled as I was. We have been on the phone for hours. I with guidance backed up and factory reset my s8. This brought in an app under settings>Apps>more>show system apps and then scroll till I came to WiFi Calling. This appeared with the reset. Apparently something like that should appear in the phone app settings and have a switch, Mine does not. Then I discovered there were codes and service mode. Under code *#9090# I found a setting that reads "VoLTE Weakcell Setting.
My question is please if anyone knows how to implement WiFi Calling on s8 I would be grateful. God bless.

kenmartel said:
I do not have very good reception where I am, so I started looking for things to help. Got a booster which wasn't much help. I then thought voice over wifi, so I checked if the s8 had it and yes it does, or so I thought. Voice over WiFi did not appear anywhere in my settings, my Telus provider was baffled as I was. We have been on the phone for hours. I with guidance backed up and factory reset my s8. This brought in an app under settings>Apps>more>show system apps and then scroll till I came to WiFi Calling. This appeared with the reset. Apparently something like that should appear in the phone app settings and have a switch, Mine does not. Then I discovered there were codes and service mode. Under code *#9090# I found a setting that reads "VoLTE Weakcell Setting.
My question is please if anyone knows how to implement WiFi Calling on s8 I would be grateful. God bless.
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Typically, VoLTE functionality is controlled by your carrier in their system.
This is how it normally works:
1) your device must support/offer VoLTE service
2) your carrier must support VoLTE
3) your carrier must support VoLTE on your specific model number
4) your carrier enables VoLTE service to your device in their system somehow or they send you a specific SIM to enable VoLTE.
In other words, VoLTE support and functionality is more controlled on their end than it is on your end.

Yes I understand, when their tech support says s8 should do wifi calling, and the settings dont appear where they should, and then after a reset an app called "wifi calling" appears in the app list, but nothing anywhere else. Except, as I was able to find, there is a service mode and there is a selection there that is called "Weak Cell Settings". Sadly I dont have service programming manual. Thank you.

kenmartel said:
Yes I understand, when their tech support says s8 should do wifi calling, and the settings dont appear where they should, and then after a reset an app called "wifi calling" appears in the app list, but nothing anywhere else. Except, as I was able to find, there is a service mode and there is a selection there that is called "Weak Cell Settings". Sadly I dont have service programming manual. Thank you.
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It could be that the network supports S8 but doesn't support your specific model number of S8, especially if the S8 that you are using is not the same model number as the specific model of S8 that they offered/sold on their network, if it's from another network and has been unlocked to be used on other networks, it may not be a specific model number that is specifically supported by their network. If this is the case, the specific model number(s) of S8 that they support would have a firmware that has the settings in the correct place but the firmware on your specific model number might not have it. Not all model numbers are equal, the firmware on each of them is designed and built by the specific network that it is branded to, with each if them having differences intentionally chosen by the network that is branded to, including what settings it has or doesn't.

Hi Everyone
Thank you for your help. Problem is solved. It is a service setting that sets the retail company selling you the phone and /or the plan. In my case I had a phone which my provider did not program when I began a new plan with them. all companies are listed and I guess the program for wireless calling is included with your selection of the company....phone responded immediately with all the proper programming. Thanks again for your time and effort

kenmartel said:
Hi Everyone
Thank you for your help. Problem is solved. It is a service setting that sets the retail company selling you the phone and /or the plan. In my case I had a phone which my provider did not program when I began a new plan with them. all companies are listed and I guess the program for wireless calling is included with your selection of the company....phone responded immediately with all the proper programming. Thanks again for your time and effort
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I've never known a device to have that setting. If your device is an international model, it would make sense to have that setting for the various regions/carriers.