HELP- Can't log into app store or activate iMessage/Facetime

I can access the app store, but only to view it. cannot download anything, free, cloud or new.
I also cannot log into the app store via settings.
Occasionally, I can get my apple ID and password to appear as though I am logged in, but iMessage and Facetime show "waiting for activation"

Anyone have any idea what may be causing this ?
I have tried setting the date forward a year, then back to auto update.
I have even changed my apple ID, but still no joy.


iPhone 5 running 6.1.2.

TYIA