Unknown caller ID indicates T mobile collections' but we don't have a Tmobile accpount. Might be facticious caller.
 Apr 04th, 2013
T-Mobile Collections
Rich K
 Nov 25th, 2011
Looks like you've found it's TMobile internal collections on 800Notes. No indications this is a third party collector in illegal disguise. Under the TSR you should be able to revoke call permission from this and any business, whether or not you are a paying customer.

Possibly you'll meet resistance since this caller, representing an original creditor, is not in a sales department and is not covered by TSR or FDCPA, but maybe your state allows you to issue a no-call demand to ''first party'' collectors.

If you want to take the tricky playback route, below is a link to my fave resource of telco alerts. The files should all be clean recordings, and the page covers several carriers and regions so you can likely find the sound files which are most authentic to your area. The site is also a treasure chest of fun facts about phone systems.
 Jun 01st, 2011
Received this call for the 3rd time on 5-31-11 at 6:41PM from Out of Area.
No message left.

Linda, thank you for the info. I will look it up...
 Jun 01st, 2011
RE: How doyou tell a recording that they have the wring number?

If you’re contacted by a machine, fight back with a machine.

Play the U.S. Special Information Tone (SIT) signal for a ‘vacant circuit’ into your receiver. The robot will dutifully erase your number from its memory.

For more information, Google ‘SIT wav file’
 May 24th, 2011
Received this call on 5-24-11 at 6:46 PM from Out of Area.
It was a recording from T-Mobile, looking for someone not at this number.
How do you tell a recording that they have a wrong number??
This is the 2nd call from them, the first one was on 5-19-11 and they didn't leave a message.
 May 24th, 2011
Received this call on 5-19-11 at 6:52PM from Out of Area.
Left no message.
 May 20th, 2011