I don't know much about security and don't know if these things are possible or not.
Last night I received a text message stating "Please use ****** to authenticate your phone number in the DIGITS from T-Mobile app"
I looked up information about the DIGITS from T-Mobile app and it looks like this is the message you are sent when you try to register a phone number with it. I don't have a T-Mobile SIM card and did not try registering it with this app, so it seems that somebody else has tried to.
I believe it could be an honest mistake, that somebody may have fat-fingered my phone number instead of theirs, but in case it was intentional, is it possible for this person to successfully spoof my number? If they were able to register it with DIGITS, then they will receive any future text messages, which is particularly concerning because I have a number of accounts who use 2-factor authentication via SMS. And is there anything I can do to either prevent my number from being spoofed, or at the very least, to protect myself in the event of my number being spoofed?
Anything at all to help me understand security better and to protect myself is very welcome!