iPhone 6 Plus stopped pushing mail and sending SMS messages. This started occurring only 2-3 days ago.

In the last few days, my iPhone 6 Plus stopped sending SMS messages and pushing mail. When mail has been received, it also started giving me a blank screen with the rotating ball while its hung trying to open old mail. I have restarted to phone several times, but that solution is temporary as it starts getting hung up again.

Suggestions?