I was doing a little battery maintenance and let the phone turn off do to no battery power. When I plugged it in to charge overnight (wall charger), it booted as expected. As it was logging in to my wifi, a login screen came up with "www.ATT.com" as the page header. It looks like it was trying to login to an apple server for some reason through my wifi. I had never seen this before and am cautious to try to sync. The only option is to cancel as the page shows "service not available" When I cancel, my wifi connection goes away.

Any ideas what is happening?