Have you put it into Airplane mode, reboot it, then take it out of Airplane mode?

Also, how are you rebooting it? Are you simply pressing the power button and swipe the "Swipe to power off"? Or are you pressing and holding both the Power button and Home button? The later is better for issues like this, you have to press and hold both buttons until the Apple logo comes back out. Which takes about a minute or so. Once the Apple logo shows, you can release both buttons.

As for no audio when you receive a text/call. Are you in Do Not Disturb mode by any chance? There will be a crest moon in the upper right corner if you are.

KOT