Who called from 2125543689

anyone else?  the caller let the phone ring 22 times

not  me....but here  is  some   info , if  helpful?

Service Provider   VERIZON NEW YORK
Type   RBOC
Location   NEW YORK, NY
Telephone Technical Information  
Central Office Code   NYCMNY50DS0
Rate Center   NYCZ 1 (NY)
LATA   132

Called and got the customary 1-2 secs of silence before hanging up.  blocked and reported.

The usual caveat:  don't presume the caller ID is telling the truth when identifying this number.
The first call is a common qualifying call, logging details about whether or not any person or any machine answers the call.  There'll be more calls, maybe from the same number, maybe from a different number.  If you or your voice mail picked up, consider yourself logged by their database.

Called at 6pm.. let machine answer... a minute of silence/static noises, then disconnect.