Why can I not make or receive calls suddenly? I Could before. I still have airtime left

[AC Question]

I have a Samsung Galaxy s4 Tablet (7") As soon as I phone out, I get a " call ended" message.

 

[belodion]

Welcome to AC.

Try Settings, Storage, Cached Data, clear the cache, and Power Off and Restart the tablet.
If no go, let us know.

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