Who called from 2142209518

I answered the phone with this number called and it hung up.

got a call from this number but did not pick up.....weird

No idea who this is and I did not answer my phone.  They did not leave a message.

This is one of a series of phone callers
They ring through but do not leave messages
With the time frames and what order in .. they appear to be related type scammer/spammers
(all are unwanted)

Here's the list so far ..

8162214361    5:12pm     2May12
2142209518    10:51am    2May12
5854368823    9:06am     2May12

2155458932    4:46pm    30Apr12
6144186666    2:40pm    30Apr12
7708502213    12:52pm    30Apr12
9712201779    12:38pm    30Apr12
7708502213    11:48pm    30Apr12
5854368823    10:43am    30Apr12
8047881415    9:40am    30Apr12
8047881415    8:38am    30Apr12
4076027668    1:50pm    29Apr12
4076027668    12:06pm    29Apr12
5148009999    11:30pm    27Apr12

I use Call Control try that app.