Originally Posted by OttoZro
I tried the *#1234#
and got the following message
"Undable to process request"
any reason why?
That's unusual but it could have been disabled in your carrier's firmware version. That code is the stock Samsung one for checking firmware version. Which model of S4 phone are you on?
(If you are with T-Mobile, U.S.A. you're probably on the M919 variant)
Are you able to use, say, the IMEI code... *#06#