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T-Mobile Wifi Calling Error: Reg90

Has anyone had this error message with their Z3? I have searched the web, and all that I can find is that Tmo needs to send an update to the phone to fix. Called customer service, waited for the update, restarted phone, and nothing. They then said to switch out the SIM card, and that did nothing either. Any others?

Yup, the same exact problem, they sent a sim update, new sim card, hell I even had them send me a new phone. Same thing. E911 is also set up correctly, lol they know where to send the bill. My daughters all have the one touch fierce and their WiFi calling works perfectly. My wife's m8 also works fine. What's the freaking problem.

I had that for a day and it dissapeared, my dad's M8 had it too and it went away somehow in a day or two.

This has been going on for 2 weeks now and no one seems to have an answer

I guess mine was slightly different.
Apparently TMO has to send you an OTA update. Also make sure its enabled in services in your MyTmobile account under services if not just tick the box and enable it.
TMO Forums:
https://support.t-mobile.com/thread/78656

I had same issue
Artood2s said:
Has anyone had this error message with their Z3? I have searched the web, and all that I can find is that Tmo needs to send an update to the phone to fix. Called customer service, waited for the update, restarted phone, and nothing. They then said to switch out the SIM card, and that did nothing either. Any others?
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I bought my mother-in-law this same phone (as I already have the D6616). Her phone had the same problem as you. Took me awhile to figure what happened, but like others have said, you need to contact T-Mobile and give them the error code. (I did this over T-Mobile chat) They in turn will push out a quick OTA update (can take up to two hours). Bad thing is I never received notification that it had updated, and I even asked the T-Mobile rep if I will see the update, and she stated yes. So, after two hours, and you still don't see the update, go ahead and restart your device. Once it reboots, your wifi calling feature will be updated and will then work. Oh, MAKE SURE YOUR WIFI IS TURNED OFF and WIFI CALLING IS TURNED OFF AS WELL! Your device will not update if you are not on the T-Mobile cellular network (as needed to push out the OTA). Be sure to turn on wifi calling once phone restarts and then you’re free to also turn on wifi.

Wifi calling error code reg90
U need to setup "e911" information with your service provider.

[Q] D820 lost signal, then stopped recognizing SIM

A few weeks ago I started having signal losses on my D820, later on it stopped detecting my SIM card altogether after I reset it.
It's been going on-and-off until about 2 weeks ago when a factory reset and cache wipe seemed to have fixed the problem - or so I thought - until it happened again today in what seems to be a permanent metamorphosis of my phone into an over-glorified 5" tablet with NFC.
So I started snooping around the googles, seems to be a common problem.
(can't post links yet but google isn't lacking results under "nexus 5 no sim no signal" and "Nexus 5 SIM not recognizing")
So far none of the "Turn airplane mode on and off" or "Reinsert the SIM / clean the slot" tech support quotes helped. The phone is physically intact, and none of the 3 SIMs I have in my disposal get any signal on the device in the rare case they even get recognized (My brother's G4 works fine with all 3). I did a few full factory flashes - ROM, Radio, recovery, everything (M4B30Z - latest 6.0.1, MMB29S, and even went back to 5.1.1 LMY48M). Also tried the latest CM13 snapshot, later on with a factory radio image on top but absolutely nothing. The CM ROM managed to consistently read the SIM but it didn't get any signal.
I would highly appreciate any information or insights, and even though I'm not exactly an expert I will be more than happy to help troubleshooting this jazz.

The phone shows the correct IMEI#? Phone is not blacklisted for some reason?

audit13 said:
The phone shows the correct IMEI#? Phone is not blacklisted for some reason?
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No reason to believe it is. Had it for over a year now, came unlocked without any contract with in closed packaging from a trusted retailer, IEMI was fine on the day of purchase.

It shows the correct imei via dialler?
Did you check imei on blacklist checker on swappa? Not likely to be blacklisted but you may as well rule it out.
If it's not blacklisted and can't be resolved via flashing roms, it could be a hardware failure.

The IEMI is fine and the phone is clean.
It could be hardware but that doesn't explain the problem being temporarily solved for quite a while by wiping the system, and a lot of the users complaining stated they started having the problem after upgrading to 6.0.1.

I've been running on stock unrooted MM for a while with no problems. A couple of people at work also run stock MM without an issue. I wonder if the problem is related to a particular batch.

"No signal" after applying official security update

Bought new Pixel 4a (model G025J) a few months ago. It worked well for a few weeks until I installed March security update. After reboot the phone stopped detecting SIM card and lost cell signal. Even emergency numbers like 911 doesn't work.
I already tried:
Change SIM card to eSIM and back to new physical.
Flash almost all official ROMs and one unofficial.
Check debugging menu *#*#4636#*#*.
Right now i bring phone to local unofficial repair service. Unfortunately they still don't have a result.
What can I do to fix it or at least diagnose the problem?
I still hope it's a software error and can be solved without replacing the phone.

Totally forgot to mention: Pixel was bought in US and I'm located in Europe

You might need to reflash your phone using google's latest images.

JohnC said:
You might need to reflash your phone using google's latest images.
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Already tried it. Still no signal.

I'm out of ideas

get the phone replaced.
you're gonna get the same issue after any and every update you apply.
time (unpredictable) eventually returns your phone to working, though. but no software fix for it.
it's a weird problem, but you're not alone. thankfully my phone was still under warranty so I just sent it in and had it replaced. even though the replacement is a refurb, better that than never being able to confidently take an update.
I had the same exact problem.
First time, I took the andoird 11 update. I ended up leaving my phone with ubreakiFix (google's official authorized repair service) who had it for about a week and literally replaced every part and worked with google's service to deem the phone unrepairable. had an RMA for it and was ready to send it out, but gave it a shot stciking in my SIM card and it was working.
then the same thing happened again a few weeks later after applying a security update. this one returned to normal after a few hours
then last week had the same thing again with another security update. this time I quickly hopped on chat with google and sent my phone out and just received replacement yesterday

Found out that water somehow got inside the phone and kill radio chip.

SM-G970U Refuses to Work on Carrier Network

So, I have an S10e (SM-G970U) that was bought from Verizon a while back. The phone was set up on a Verizon post-paid plan, but was later switched to prepaid. The phone worked fine for months, but about a week ago, the phone randomly stopped making and receiving calls, texts, and the ability to use mobile data. It was taken to Verizon, and they tried "all they could" in their words, which included a new SIM card, resetting network settings, and eventually a factory reset from settings. Nothing seemed to work, and they gave up, claiming it "seemed like a bad antenna." They did call their "tech support" who claimed the most recent Android 11 update supposedly caused an issue with mobile network connection with the Verizon S10e devices, which I haven't heard of, but didn't know. He claimed a reset would fix it.
Since none of that fixed it, it was taken to a shop to be inspected. They claim the phone has nothing wrong with it. So, that, in theory, rules hardware issues out. Their only claim was that when an AT&T SIM was inserted, it was able to connect to the network, but never tried to make any calls due to the SIM not being activated. I assume this is due to someone trying to "help" inserting an activated AT&T SIM into the slot when testing, which I assume ended up installing the carrier branded version of the firmware. They gave a couple possible reasons, but neither seemed to make sense.
Since it had the AT&T bloatware and was working with only AT&T SIMs, I decided to flash both the VZW G970U firmware (the earliest version I could to ensure the supposed "issue" from Verizon support wasn't a problem) and the G970U1 firmware. Both firmware flashes have seemed to have done nothing, as the phone is still having the issue. Most times, it will connect to the Verizon network, but the signal seems to rise and fall quickly (like the bars going from 5 to 1 to 3).. Still no calls, texts, or data, though. I have no idea what's going on, at this point, honestly. Any ideas?

Hardware problem

iBowToAndroid said:
Hardware problem
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LanGar21 said:
Since none of that fixed it, it was taken to a shop to be inspected. They claim the phone has nothing wrong with it. So, that, in theory, rules hardware issues out.
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Click to collapse
If the people it was taken to were competent and did their jobs correctly (one of the best around, according to reviews and carrier recommendation), their diagnostic results show no hardware damage to the phone. Then again, their explanation for the problem was that it had been locked to ATT network (a Verizon bought phone that never had any affiliation with another carrier, aside from Verizon and a month-long stint with Straight Talk). Some idiot she knows that used to work for a Verizon retailer popped his ATT SIM in there, and it flashed ATT firmware.. Their POSSIBLE solution was to try and have it network unlocked from ATT. As we know, though, the IMEI obviously did not change, and the process of confirming the identifier is done on the mobile network level. Therefore, flashing a different carrier's firmware won't do much (permanently), aside from changing the boot screen and bloatware apps. We even tried to explain to the guy that the ATT SIM had never been popped in until after the problem began, as there was no reason to beforehand. I also mentioned I had flashed firmware multiple times before I ever came to him, to no avail. I should've pushed harder, but I had been out all day, frustrated and ready to go home.
It's been over a month since that issue began, and I haven't thought much of it lately.. We've since found her a new phone (and stowed the other one in a drawer). Those guys did blurt some moronic statements.. In hindsight, I'm not too sure I should trust their judgement after hearing what I did. Maybe it was an antenna issue or otherwise hardware, but I sort of assumed if anyone can happen to keep a repair shop open, they'd at least be able to complete the simple tasks fairly easy. I don't know. I'm not paying another repair shop to find out, though.

I had a very similar problem where my phone would just randomly lose all connection for about a minute, then it would reconnect I would start doing whatever I was and it would do it again and this one on for months. I took it to AT&t and they told me to replace the SIM which I did and it didn't work. after a couple updates it fixed itself.

Question eSIM Broken, Sim Manager Screen Frozen, Unable to remove eSIM

Hi all, currently having an issue with my phone which I am unable to resolve. I'm beginning to think I may have completely broken my phone.
Yesterday I decided to install a Lycamobile eSIM on my phone. In doing so, it has broken SIM manager and also caused my device to stop recognising my physical SIM (which is with EE).
I've attached a photo of the issue. Here's what happens.
When I enter SIM Manager, the loading animation continues for quite a while. As you can see, the eSIM has no phone number assigned to it, and my physical SIM, which is inserted in SIM slot 1, is not recognised.
Whenever the loading animation decides to stop, er, loading, I access the eSIM. When I click to remove the eSIM nothing happens.
If I scroll down and go into More SIM settings and click to Remove all eSIMs, nothing happens.
I was on the phone to EE today for about an hour and a half. In that time, they tried to get me to install an eSIM but it didn't work. Every time I try to install it, the screen simply vanishes, taking me back to SIM manager.
After exhausting my options with EE, they referred me to Samsung. Samsung told me to contact Lycamobile, who in turn have decided to send me a new QR code in order to install a new eSIM...which also did not work.
I have reset network settings. I have cleared the cache partition. I have factory reset the phone twice. I read that apparently you should get the option to remove an eSIM when you factory reset, but I'm not sure if that applies to Samsung phones and that option has never been available to me. I did contemplate flashing the firmware (it has been many a year since I did that), but it appears that this wouldn't resolve the issue.
I'm stumped. The phone is in warranty, so I suppose I could send it back to Samsung, but unsure if and how they would be able to sort it.
Any advice would be hugely appreciated.

Try this: put a sim card in the 2nd slot and then try removing the eSIM.

TheMystic said:
Try this: put a sim card in the 2nd slot and then try removing the eSIM.
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Click to collapse
Unfortunately the physical SIM is still not recognised in slot two, and I am still unable to remove the eSIM. As I said, whenever I access the eSIM and press Remove it doesn't work.

Have the same problem. Trying to fix it for a second day now.
What I tried so far:
Factory reset
Clear cache
Tried to remove it - nothing
Reset network settings
Reinserting sims in different variations
Checked physical sim in different phone - which works
Tried to reflash it with Odin, esim still there
Has anyone got some different ideas of what to do?
Thanks

THMRK1 said:
Unfortunately the physical SIM is still not recognised in slot two, and I am still unable to remove the eSIM. As I said, whenever I access the eSIM and press Remove it doesn't work.
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If a factory reset doesn't fix a problem, then it means a bug in the software. This is unacceptable bug. You should try getting a replacement under warranty.

I'm assuming phone is unlocked. Any particular reason you are using EE firmware? I would try, via Odin, unbranded firmware

Samsung punted me back to EE and sent me a repair centre. They managed to fix it. According to the repair notes they replaced some hardware:
"Replaced a part that holds internal parts in place."
"Replaced an internal flex component."
"Replaced the main board (?!) inside your device."
They also flashed some firmware, which they say on the repair note was "the latest version" but I got a security update download notification as soon as the phone was setup.
This was done at a same day repair centre and I got the phone back after a couple of hours, which was unexpected.

raul6 said:
I'm assuming phone is unlocked. Any particular reason you are using EE firmware? I would try, via Odin, unbranded firmware
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To answer this question: EE are my network provider, and thus is a contract phone. The phone is unlocked though, EE did confirm that to me. I would have flashed firmware as a last resort but was keen to explore every other solution first. In the end, EE did manage to fix it by replacing some internal components (detailed in the post above).

THMRK1 said:
To answer this question: EE are my network provider, and thus is a contract phone. The phone is unlocked though, EE did confirm that to me. I would have flashed firmware as a last resort but was keen to explore every other solution first. In the end, EE did manage to fix it by replacing some internal components (detailed in the post above).
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Great! All well then

Sorry to bring up an older topic but is there any other suggestions to get this solved. I've got the exact same issue caused by a Lycamobile SIM. I've sent my phone back to Samsung but they won't repair under warranty because of minor cosmetic damage and I don't want to pay for an expensive repair for something that seems like it's a software issue.