I got water damage on my S6, and while I wait to see if it works when dried or get a replacement, I am trying to reactivate my S4. However, the "change phone" option in Self Serve won't accept the SIM number on the card. I tried entering the IMEI number from the device status screen, which brought up the error message "New hardware is incompatible with the old hardware. The equipment exchange cannot be performed." Can older phones no longer be used on your network?