Called at 11AM today, I didn't pick up.

Getting calls several times recently, day time, some voice asked  "unknown caller, would you like to accept it?"
I still do not understand is it a protection from T-Mobile or it is from them.

Didn't answer, but I saw the comments here about the cruise and I've gotten those before. Ugh!

Called and I answered.  Other end was silent.

Got call from the number but know not to answer calls from an recognizable number. Stop answering.