This number keeps calling and leaves no message.

i answered, which activated their operator to start talking. he said something about my wireless service before hanging up abruptly mid-sentence.

I have received a call from 813.211.0000 twice, both in the morning.  I have missed both calls and they never leave a message.  I tried calling the number back and you get a recording from the operator.

just got the same call....wtf?? i get random ones like this all the time.. but noone answers..

i answered it not knowing who it was. they said they wanted to make sure i was receiving the best possible wireless service. I heard a click and they hung up. It was a live caller. I couldnt' tell who the company was as there was a lot of noise in the background and the line kept "clicking" as he was talking.

Same as others, called my cell phone, didn't answer. Voicemail was silence..

same as everyone else

This # called me today and I have NO idea who it is. I called back and all I got was a busy tone.

This number has called me before but has not left any message.  I have no idea who's number this is.

this number keeps calling my cell phone

Answered phone call and no response.  This has happened twice.