This person has called me consecutively for about a month with a 14 digit number also: 18801812550924. Whenever I try to answer this person calls, the only response I got were "Hello"s and immediately hangs up on me each time. I would like to have both caller's number blocked from my phone: 1-347-421-4275. When I called T-Mobile, there were no help.
Norma Lui
 Jun 12th, 2012