Is the same iCloud account required for FindMyPhone on multiple idevices? Family iPhone 4 and 4s on same wifi network and different iCloud accounts can't find each other.
If so, what about this? From http://support.apple.com/kb/HT5621?viewlocale=en_US
Apple IDs that use iCloud email addresses (addresses ending in @iCloud.com, @me.com, or @mac.com) cannot be changed to another email address.
How do I change iCloud email address to same?