Data won't turn back on when wifi is turned off

[AC Question]

I just purchased the Samsung Galaxy S6 and once i disconnect it from wifi my 4G won't come back. What should I do?

 

[Rukbat]

Bring it back or, if you had it delivered by someone other than your carrier, request an RMA (return of materials authorization) to have it replaced.

If you got that backwards, and you lose 4G when wifi is on (and that may be only an AT&T thing), it's normal, so if that's the case and it's not AT&T, check with your carrier.