It's a caller ID app for incoming calls and has a monthly charge. One of those apps I'd love to delete so it's not accidentally triggered.
From T-mobile site:
Name ID: Know who’s calling—before you pick up
Ever not answered the phone because you didn’t know who was calling—then discovered later that you’d missed an important call? Now you can find out who’s calling before you answer, with Name ID. This service shows you the names and phone numbers of your callers, even if they’re not in your address book.
Name ID is available on many phones for just $3.99 per month. To find out if it’s available on a particular phone, simply view the phone’s details on T-Mobile.com, click the “Features” tab, and look for Name ID in the list of features.
Try it FREE on new phones!
Get a FREE 10-day trial of Name ID when you buy select new phones. After 10 days, you’ll be asked if you want to continue using Name ID for $3.99 per month.