Lost capability to text: Contacts show sip:[phone number]@msg.pc.tmobile.com;user=phone

No fix for me using the stock texting app. I ended up installing Textra and I don't have the same texting problems.  Not an ideal solution, but it's a work around until tmobile gets their act together.

I was having the exact same issue.  I called T-Mobile support and talked to three different people, the last one was actually a Samsung Tech (I have a S23).  We figured out that I was using an outdated Messages app (it had the 3 dots on the icon), that had been transferred over from my old S8.  The correct version is the one that has a blue message bubble on the icon.  Hope this helps. 

I found a quick fix for this strange problem.

apps: Messages-

Defaults: Clear Defaults

Working now as normal and phone number is normal and not Sip….

Fix it with 

Settings:apps:messages:defaults: clear defaults....this is a Samsung issue not T-Mobile. The system update caused it so please don't blame the carrier blame the maker of the phone.

I am having the same problem and it only seems to be with one number.

Same.  I can't text my Dad, a fellow Android user.  

😭

 I was using the Samsung text app when this happened to me.  You know b/c is is the blue icon with the 3 white dots.  Switch to google texting app.  Need  to go to Samsung app in all apps, click off default app.  Open Google app, set as default and my problem with sip in my text message was solved.  It's true, Google message app is a no thrills customization but it WORKS.

merri101 wrote:

 

I'm having the same problem with a new contact. She can text me, but I can not text her. Weird. Please fix 

Same issues.  On July 9th I lost the ability to text my parents, but they could text me.  Now when my dad texts me, it comes through as a weird sip message.  Tmobile has done their typical trouble shooting, which did nothing except after the "network reset" i can no longer text a 3rd contact. They're mailing out new sim cards for the 3 phones... 🙄