Do you have 2 SIMS setup on your phone?
I would think P is primary and T is travel.
Your Visible number should be associated with one of them.
On an iPhone you can disable SIMS that are not in use.
Thank you for your reply. I know what the T and P stand for. My question is if calls made with the T designation are charged to your account per call. The system won’t let me make calls or text using the P designation.