GalaxyJ7 default Phone app not working

[dulumian]

Able 2 receive inward calls but no outward calls possible. Not able 2 use phone. Now and then d following message pops up -
Unfortunately phone has stopped

 

[B. Diddy]

Try wiping the cache partition: https://support.t-mobile.com/docs/DOC-30305. If that doesn't work, see if it still happens in Safe Mode: https://support.t-mobile.com/docs/DOC-30290