How to make this cellphone ring?

[Mobile1]

When I turn on this cellphone, when called it does not ring.

I must go into Settings and test the ringtone.

How can I have it ring immediately?

 

[B. Diddy]

After you test the ringtone, does the phone ring properly? Does this happen in Safe Mode as well? https://support.t-mobile.com/docs/DOC-27781