I just had a new Samsung Galaxy S3 on the Credomobile (Sprint) network shipped to me as a replacement for my existing phone. When setting up an Exchange account the Galaxy S3 goes into the Emergency Calls Only mode - every time. Credo sent out a new phone, but it does the same thing. I have reverted back to my Sanyo Vio phone and can access Exchange just fine. The differences are Ice Cream vs Jelly Bean, and a separate Exchange client vs an email App that also does Exchange. Same network, different results. I have returned the Galaxy S3 phones - I have to have access to my mail server. Any ideas as to why the Galaxy S3 goes into brick mode when an Exchange account is configured? Other testing: 1) Factory wipe & reboot, then set up everything without Exchange, and everything works great, flawless, and fast. Add an Exchange account and the phone turns into a brick. 2) Factory wipe & reboot, deny any Google account information, don't set up any features at all, and then add an Exchange account - phone turns into a brick. Again, the Exchange account works flawlessly on the Sanyo Vio with Ice Cream and a separate Exchange client on the Sprint network (as a Credo phone). Any ideas?