T-Mobile just introduced Name ID, which is essentially the same type of caller ID that is available for landline phones. Right now when someone calls your smartphone, the name is only displayed if they are in your address book. Name ID will give you the name and phone number of everybody who calls you, including the ones that are not in your address book.
I can’t think of how many times my phone rang and I was wondering who it was: should I ignore or answer? This is a welcome addition, but as expected, it is not free. They are offering it free for 10 days, but after that runs out, it will cost you $4 extra per month. I am not sure if it is worth it to me because anyone who is important is already in my address book, but for those of you that may use your phone for over 1,000 minutes per month, you might find it to be a good deal.
For now the service is only available on the Samsung Exhibit 4G, and later this month the myTouch 4G Slide will be supported. Of course, more phones will jump on board in the near future.
One other interesting tidbit is that this service is handled by Cequint, who are the makers of City ID, which comes preloaded on many phones as bloatware.
[via phandroid]