Voice on Nokia 225 no longer working.

@fireguy_6364 It had been using VoLTE on this device for a year without a data plan.  I thought maybe that might be the issue so I added data and it's still not working. 

I found a subreddit it it's not just me having this issue from what I can see.  It's now impacting lots of people on TMobile with the Nokia 225 and none of them have any resolution listed. 

Something happened recently which messed up the phones compatibility with T-Mobile. 

some kind of update perhaps that caused it..could have downloaded in the background and not have been noticed until the next day. only thing that would make any sense.

I have the same issue with my beloved Nokia 225. It can send and receive SMS just fine including multimedia. When I try to dial, it just says "Dialling" indefinitely and then eventually stops dialling. It is not possible to receive incoming calls. Like a previous user, I obtained a new unit of the same model and the behavior is unchanged. I have full bars, and the phone says "LTE" over the bars. I spent an hour on the phone with T-Mobile a week or so ago: they verified that the IMEI indicates a compatible unit, they found no issues with the network, and their standard tests turned up nothing. I brought my phone to a T-Mobile store and the rep's there verified that swapping my SIM card into another unit allows that phone full functionality. I'm quite disappointed at the prospect of having to purchase another phone when this one is 4G, and I've lost faith in T-Mobile's compatibility checks since (as I also verified) their compatibility checker explicitly indicates based on the IMEI that this phone should work.

I have a s10 cell that is on straight talk. I just got my tmobile home wifi early november.. definitely a week or so later I noticed I couldn't make any outgoing calls when at my house. It says dialing, silence, 20-30 sec, & hangs up. 

Then I realized I also couldn't get calls. Calls incoming would go directly to voice mail. 

I can walk up to top of driveway & it works. Every where else it works. 

If im halfway up driveway calls come in but will drop, people can't hear or understand me. 

It's gotta be the wifi. 

T-Mobile's APN settings haven't changed in what seems like forever.  You can find the APN Settings though here. 

https://www.t-mobile.com/support/devices/not-sold-by-t-mobile/byod-t-mobile-data-and-apn-settings

I called up T-Mobile about this issue (again), and they recommended that I contact Nokia about it. Nokia, in turn, recommended that I switch the network type to "2G." That turns out to work for me: I can make and receive voice calls as before now. However, it's a crutch: as Hazel Ra noted, the 2G signal is weaker than the 4G signal, so conversations are broken and calls get dropped. I asked Nokia about this via email:

I then called T-Mobile back to ask whether their 2G network will eventually be taken down, and whether they play to fix this issue with the 4G in some phones. Unfortunately, the rep spoke imperfect English and didn't understand all my concerns. She did note that the network in my area is currently being upgraded so the signal should be getting stronger, but I'm not sure that's the 2G signal she was referring to. When I griped that this has been going on for two months, she credited some money to my account. That's sort of taking responsibility, but it doesn't indicate whether anyone is working on a real fix. So I can't tell from this whether Nokia is taking real responsibility for this apparently-known issue, or whether T-Mobile is, or whether no one is.

I am having the exact same problem. Nokia 225 worked with VoLTE for a month or so, then stopped. VoLTE was not using any data, so it doesn't have to do with data. The problem must be with the network itself. Wonder if anyone has this phone working with AT&T or Verizon?

Interestingly, I used to have Tello, where the Nokia worked on VoLTE. When that stopped, after a week or so of outage, I switched to T-Mobile itself. When I switched, VoLTE worked for maybe 4 more days. Then stopped. How could that be?

The phone will now occasionally make calls using the ancient E or G networks, but I seem to have no control on whether or how it accesses these older networks. Also, their coverage and quality is poor.

Texting works fine, except the timestamps on the incoming texts are wrong by an hour or two. However, this timestamp problem predates the VoLTE issue.

Has anyone solved this?

Following up, switching to 2G or 3G does not work. Just says no network and doesn't function (even to find E or G).

Also, all other flip phones on the US market are either locked, crap, or both. Don't want to switch.

Update: I drove to an event around 3 hours away yesterday, out in the country. When I arrived, I had no signal. But lo and behold! VoLTE had turned itself back on (I didn't switch anything). Excited, I waited until I got back in range, and made a call to my wife. VoLTE was still on. But the call didn't work anyway. I heard nothing. Later, she said it rang, but was just a dead line when she tried to answer.

After a couple of tries like this, I turned the phone off and on. When it came back on, VoLTE was gone.

This suggests that the 4G network signal is the thing bricking VoLTE on the 225. Once I lost the signal, perhaps the phone was able to go back to VoLTE without interference from the network.

Thanks to those who suggested switching to 2G. This works, though as people said, the signal can be spotty. In fact, I have gotten my Nokia 105 (3G and below only) to work again in the US (even though, supposedly, it does not use US frequencies - it's a European model). Since the 105 is pretty much identical to the 225, except smaller, it's a better choice.

Finally, switching to 2G fixes the problem of incoming texts having the wrong timestamp. So it seems that the weird text timestamps are a 4G issue as well.

I think the poster above who said that Google changed something in their VoLTE implementation may be correct.

The issue is being discussed here on Reddit and the person who started that thread and a commenter has identified two Android handsets that (a) lost VoLTE (on Android 7) and (b) didn’t have VoLTE or IMS registration on Android 9 but saw it begin to work when he upgraded to Android 11.

From that discussion "So my guess is the speculation is correct. Google has changed something that prevents older Android handsets and non Android/iOS/Kai handsets from using VoLTE."  It's probably more correct to say older Android versions, but what exactly changed?