I used to text this mobile phone for several months. I am using a Samsung Galaxy S21. However, today, the text fails to be sent. Then, I look at my contacts for the mobile phone number and it is changed to:
I removed this and updated the contacts with the correct phone number, but the text does not go through and the contacts is changed back to sip:[phone number]@msg.pc.tmobile.com;user=phone
Any idea what is going on? I am able to text other people.