I can't re-active my Iphone 6
I did a reset on iPhone 6 and now I can not get in with my Apple ID. I have checked and the ID works on my Mac Book and on iCloud. It starts by asking the country then I connect to Wifi and after the Active Iphone comes. It keeps telling me its an address that begins with letter D and it's a yahoo account. Why can't I get into my phone? Help please!
iPhone 6