Why can't I use the Internet while I'm on the phone?

I have a galaxy S7 from straight talk and I think it has something to do with verision. Anyway I can't use the Internet while I'm on the phone. How do I fix this?

from Android Forums at AndroidCentral.com - Ask a Question //forums.androidcentral.com/showthread.php?t=773582&goto=newpost
via IFTTT