Voice on Nokia 225 no longer working.

Okay, if it's KaiOS, what changed? And how did my phone receive this change?

The past few days, the phone has been displaying this message: "Settings update available. Update?" (or something similar). When I choose to update, it says, "There was a problem with your memory card. Update failed" (or something similar). Hey, thanks.

Still plugging away on 2G for now. Works when there is a signal, which is in most places

I'm assuming that Kai OS devices still work since it's my understanding that the Nokia 2780 and 6300 are still functioning.  That may be a wrong assumption since I don't have any Kai OS devices.  As for what changed, I don't think it's anything in your handset that changed, but rather that Google made a change to their VoLTE specification that either intentionally or unintentionally blacklisted all handsets that don't have a specific something in their ROM which allows it to continue to use VoLTE.  What that specific something is, or what it does, I don't know.

But whatever this is, it would be good for T-mobile tech support to tackle this issue and let the customers known as there are a lot of handsets out there that are 4G/LTE/VoLTE capable - and were working using these protocols on the T-mobile network until just recently (long after the 3G shutdown).

you wont see any TMO answers in here..primarily peer to peer assistance with a handful of mods/admins to keep the site in order only.

Oh, my mistake, the Nokia 225 has something called System 30+ OS, not KaiOS. KaiOS is what those crap flip phones like the Cingular Flip 4 or Alcatel Go Flip use. Those are terrible products (slow, texting is hard, counterintuitive interface), but they do work on VoLTE, or at least they did a couple months ago.

MRL, when you say that Google made a change to its VoLTE specification, what do you mean… how is Google involved with these cell phone networks?

Google is the pioneer/developer of T-Mobile's WiFi Calling and VoLTE.

On January 25th 2023, I called up T-Mobile again in response to an email I had received indicating that my phone needed upgrading. That email had contained instructions for updating the SIM card, but it was meant for smartphones, and following the links did not yield any instructions regarding the Nokia 225G. I called to ask whether there were instructions regarding the Nokia 225G. I spent 45 minutes talking to two different (very committed) tech support people. Over the course of the call, they asked me twice to dial the sequence *#*#4636#*#*. This didn't change anything. The support conclided that this device is not supported, there are no plans to support it, and I was encouraged to go get a free phone upgrade. The conversation triggered an email to this effect:

"Thank you for contacting T-Mobile! You may view your active recurring equipment credit promotion details by logging into My T-Mobile at https://my.t-mobile.com/promotions”

I asked the engineer to make sure the T-mobile website no longer indicates that this phone (as identified by its IMEI) is supported, and they respectfully made a note to do this.

Today, I noticed for the first time on my phone that VOLTE appears to the left of LTE, on the top-right corner of the display. My Network type (settings → connectivity → Network settings → Network type) is set to 4G/3G/2G. And, surprise surprise, I can now place voice calls! I turned the phone off & on, and both the LTE and the VOLTE reappear. Something appears to have been fixed on the T-Mobile end. I'd be curious to know whether others find the same result.

Hey Finlator… Wow!  You are correct!  I can confirm that my Nokia 225 4g is once again using the 4g VoLTE, and works like it is supposed to!

I had no confidence that T-Mobile might acknowledge/fix the issue and just throw up their arms saying they no longer support the phone since it is not one of theirs.  I moved on and purchased an inexpensive smartphone as a replacement that would/does work, but moved the SIM back over temporarily when I saw Finlator's post and sure enough it is back and working.

Thanks for posting the follow-up, Finlator, just as a little bit of closure, and for any people still working on it.  I had moved on and unlikely I would have moved the sim back and tested otherwise.

Though, as a tech-type, it would be interesting to find out what broke the system to begin with and what they did / how they (T-mobile) knew it needed to be fixed.  Did it have anything to do with Finlator's (and other's) long Tech Support calls?  It feels to me like, after a long call like that, if the problem only affects a tiny portion of users, it likely gets escalated to the very bottom of an unimportant pile that never sees the light of day.

Got a Nokia 225 4G last week and it is working for me without any issue. It is on 2G/3G/4G and showing VoLTE. Text messages are also properly synced. Out in California. I really hope this sticks around because the phone is perfect.

Hmm. Sounds like the timestamp thing is only my problem. Wonder what it is?

Mexicatl, hope you enjoy the 225. If you are ever in Europe (or elsewhere?), the 105 which works on 3G only is also great.

My wife had this phone and found it was failing more and more often in the last few months, and when she was last in Canada she could call me and I could successfully text her from the States, but I couldn't call her and no one in the US could either. Tmobile customer service and store staff had no explanation. So if for some this phone is still not working and you can't get 2G service (many areas of the US now can't), consider that most people on this post seem to be using the legacy voice/text prepay plan, as I and my wife both do. This means that since the Nokia 225 has no KaiOS, base open source Android, or other operating system or wifi capability, they can't update the firmware on the phone. The "system reset" that everyone has been talking about about does not update anything. The only way to update the firmware is by having a data plan, a choice which doesn't make a lot of sense for a dumbphone. Fortunately my father lost his legacy Tmobile prepay plan and had to subscribe to one with data (UltraMobile $3/month plan), data that he will never use, so if this phone is still not working I am going to try using his SIM card in her phone and clicking on the software update tab.  Interested to know if this works for anyone else.