Invalid MMI Code - Galaxy S III Q&A, (US Carriers)

I was trying to dial *#06# in order to check my IMEI and I keep getting the error "Connection problem or invalid MMI code." I'm currently running the at&t version on Diet ICS 7.11.12. Any idea what's up?

From my understanding, codes don't work on phones with custom software.
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#1234# in dialpad results in "Connection problem or invalid MMI code" - cause?

#1234# in dialpad results in "Connection problem or invalid MMI code" - cause?
This happens with pretty much all # codes I enter into the dialer, says "USSD Code Running" and then results in "Connection problem or invalid MMI code" - what caused this - used to be fine I believe before rooting and flashing.
"finds a gun and shoots himself"
Its *#1234#
xinfinityoO said:
"finds a gun and shoots himself"
Its *#1234#
Click to expand...
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Epic fail on my behalf. Thanks.
ok dont know if it will work for you but it worked for me
add comma (,) in the end of the code
example:
*100*2# into *100*2#,
works for me
It might be because your rom. Why do not you try installing a different rom see why.

*#7465624# aka *#SIMLOCK# doesn't work: Connection Problem or Invalid MMI Code

first off when i input the code i get nothing, nothing happens.
when i call the code this appears "Connection Problem or Invalid MMI Code"
i searched for solutions but nothing
help pls
Codes only work on touchwiz firmware, aka. Samsung stock or modded if I remember correctly.
Also, if you're using other dialer than original you can get same error.
Sent from my GT-I9300 using Tapatalk 2

[Q] ''connection problem or invalid MMI code'

little bit problem when I dial *2767*3855# that time not going f-reset. seen errar ''connection problem or invalid MMI code'any idea to slove it.thanks in advance

[Q] Help

I keep getting the error connection problem or invalid MMI code when trying to run an ussd code and when i try to call someone i keep getting the out of service area how do i fix these two problems

Cannot change CSC Code

I want to change csc code by dialling *#272*IMEI# but I get a message saying "connection problem or invalid MMI code" everytime.
I have a dual sim Samsung Galaxy A50 SM-A505FN.
Does anyone have a solution to this?

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