Text notification issue

I previously posted about how my text notification was not working. Found out it was paused. Turned back on and works for a few days.

Get this email notification today stating my contact number is invalid. It’s my correct number and cell provider.

It automatically moved to pause. Why is it saying invalid and how do I resolve from it happening again?

This is probably a result of some previous SMS messages not being able to be routed for some reason.

So that we can best assist, please send a private message with your exact carrier (if it is something like a regional carrier that uses national company infrastructure, tell us the regional carrier) and the model of phone. Do you have any issues with other phones’ SMS messages or just this one?