How To Fix Connection Problem or Invalid MMI Code Error In Android [Updated 2024]

Every now and then, you may run into the Connection Problem or Invalid MMI Code pop up error on your Android device. This generally happens when a user is trying to send an Man-Machine-Interface code, aka MMI code.
What is a MMI code you ask? It’s those funny codes you enter on your dialer that includes an asterisk (*) or hash (#) characters, like calling #BAL on your Verizon Wireless phone to check account balance, or sometimes it’s just a prefix code you enter before a phone number.
If the Connection Problem or Invalid MMI Code problem is driving you nuts, we got a few solutions that should solve your issue.

[@marifetampoy2853]

Thank you sir, problem fixed☺️ I disabled my other sim and enabled only smart sim ,and I try to check my balance after,and it was been fixed ☺️

[@marifetampoy2853]

Good day sir, how to fix problem in keyboard realme c15 , keyboard doesn't appear on the screen.Thank you.

[@itzhien]

Omg thank you so much the third (3) method works perfectly for me 💙keep up the good work

[@rashida4347]

Thanks for teaching us

[@jersonlabang3417]

How about when it says that "Error from Application" ?

[@swishatrisha6430]

Phone makes calls and texts but still doesnt go away keeps popping up

[@brandontrimble5971]

It was a very informative video. However none of the solutions worked. Any other ideas?

[@jjsmnow]

Music levels are to high compaired to voice. You dont need music . Save yourself from extra work.

[@agustdbae_suga9955]

Thank you soooo much!

[@janisgoldberg7187]

Thank you so much

[@allenfritts4847]

I thought i heard you say at the beginning that this would work well lo and behold it doesn't work

[@hanifrahimi9965]

Couldn't help

[@raymondlacsamana9189]

Anong code sa samsung A7 2018

[@AnnieNelson-wo6bm]

Watching this in hearing fuck fuck fuck in my head.. someone is messing with my phone

[@michaelbrown5009]

It was not helpful phone still doesn’t work

[@IgnProfe.]

Did you found any solution? Let me know bro

[@ShaynDemons]

Thank you😊

[@Lifomatics]

Harsh background music

[@SheRico-dr1mk]

Paano kapag DITO simcard

[@leoschneider4889]

I'm having connection problems or invalid MMI code.Could you correct it please

[@shukriahussaini8491]

Mine is the same issue nothing worked 😢

[@shichikim174]

Same here😢

[@AsmrrrHub]

@@shukriahussaini8491bro did you get solution ? Please tell me 😢

[@alphaedenacademy]

Mine says Connection problem or invalid MMI code and none of these could solve it. Anyone with solution?

[@rezaulrana225]

redmi note 10s আন অফিসিয়াল ফোনের এই সমস্যা দেয় কেন

[@preciousisart]

Wow, it helped 😁😊

[@hot.graciana]

Sure?

[@gumball466]

Get rid of the music, it's loud and obnoxious. You talk then the music blares. Just talk!