T-Mobile WiFi Calling Error: REG90 Unable to Connect

11/16/2013

I swapped out my T-Mobile SIM card yesterday for one of their new Advanced Security SIMs, and WiFi calling suddenly stopped working. I poked around the Internet and found a lot of posts about REG09 and REG99, but not much on REG90 except one misinformed post where someone said that they had to return their phone.

If you swap your SIM and get this message, fear not. Your phone is not broken. Just call up T-Mo (from another phone) and tell them you got that error message. They'll ask you to power down your phone, they'll send an Over-The-Air update, then power your phone on. After that things should work. One thing to note is that newer Android phones really don't "power off" when you select Turn Off. They hibernate. To really power off your phone, you need to hit Restart. This is assuming you have Fast Boot enabled (which is on by default).

The whole process took about 15 minutes, but only because it took a while for me to realize that "Turn Off" isn't really the same as shutting down. Gotta restart for that.

Zetron

11/24/2013 11:30:32 am

Thanks for the post! I am going to try that out now. I recently purchased a Galaxy Note 3 with a new "advanced" SIM card as well and I get the same error message. Your post was very helpful, and I will call T-Mobile now. Thanks again!

jigga

3/25/2014 10:51:28 pm

thank you your post was very helpful all I had to do was restart the phone and its perfect again

DaleRox

6/1/2014 01:48:58 pm

Thanks a bunch....Worked great! I have a new Note3. I called from my mobile. No need to call from another phone. Just dial 611 from your cell phone and T-Mobile picks up. Make sure your wireless is off. Tell then you got the error Reg90 unable to connect. The update push can take up to two hours. Once I saw the message on my phone that the said the update had been pushed. I shutdown my phone, pulled the battery waited 10 seconds put the battery back in, fired up the phone and bingo Wi-Fi calling is now working!

Ali

7/26/2014 09:56:06 am

I just had to restart my Note 3 - no calls to T-Mobile!!

Brian link

1/3/2015 06:01:58 am

Error code REG90 unable to connect
Chat to T-Mobile more than 3 times.
First they asked me to replaced SIM card then they will send OTA to update, but no luck
Second wait for 2 hours and turn the phone off then on. Still no luck
Third Customer support tell me to do every step: same as above
Still No luck.
Forth Call customer support by phone: Same steps again nothing help.
Please tell me more if there are something to help me out Thanks!

elisa

1/13/2015 03:02:18 am

Having this same issue. Tmobile is sending. Me back to the store for a new sim.hope it works

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T-Mobile WiFi Calling Error: REG90 Unable to Connect

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