Iphone 5 won't update, won't connect to itunes?

My iphone 5 won't do the software update and will not connect to itunes so I can't do it there. What do I do? My text messages aren't sending, I can't use apps or go on the app store.

Check your:
- usb cable
- app store location

If all else fails, you will need to back up your contacts, settings and history favorites. Then, perform a hard-reset on your iPhone 5.