IPhone 5c on T-Mobile incoming calls not showin phone numbers is there away to convert back?

Whenever I receive a phone call it shows up unknown caller or the persons name who it's registered to or where they are calling from instead of the phone number. It wasn't always like this it started doing this about a week ago and I haven't changed any setting. I have looked in the settings and I have tried restoring my iphone but the problem still exists is there away to change this or should I call customer support?

OMG, don't be so afraid to call t-moble customer support.

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