Wanted me to provide personal information without telling me what the call was regarding.

This is a collection company called CAB asset solutions, a viral predator who harassed consumers over illegitimate collections passed off from T-mobile. They also use cell phone numbers to avoid the federal and state requirements about harassment while collecting debt. Some other numbers they use are 720-325-2718, 720-763-9908, and 720-545-1336. They are not to be trusted.

These calls keep coming in on my cell phone. I NEVER answer calls that come across as Unavailable, Private or just a phone number. If I ever do answer these calls and they want to confirm personal information then I'll just hang up on them. They obviously have that information and NO, YOU SHOULD NEVER CONFIRM PERSONAL INFORMATION OVER THE PHONE. If it's really collections from T-Mobile then they had better look into the information better. My bill has been PAID OFF for many months and I still have the confirmation letter to prove it. These people had better just cease and desist calling people from cell phones and show who they are on caller ID.