after 8.4.1 update cannot sign in to imessage or facetime
I have an ipad with wifi and 3g, location services are working and set to auto, the time and location are correct. I am signed into itunes and icloud. icloud files are visible and can be opened. What I cannot do is sign in to facetime and imessage. Over the last few days I have updated both my iphone and ipad to ios 8.4.1 and installed whatsapp on my iphone I cannot believe whatsapp on my iphone has affected my ipad. Iphone is working perfectly with facetime and imessage both working. Ipad model is MD370B/A. I have done normal things such as resetting, signed out of everything and then managed only to sign back in to itunes and icloud all in various combinations. Check support communities but so far no joy. Any ideas as to what I should do next? Thanks - David
iPad (3rd gen) Wi-Fi + Cellular, iOS 6