My phone is disply invalid MMI code?what is solustion?

Hi I need help with my SANSUI LIFE PAD
Every time when I"m checkig my airtime balance, it says invalid USSD or MMI code , what should I do ?

I am getting a message saying MMI code on my Huawei Y300. please help

installed ussd mmi fix but again code invalid MMI code

Hey there! I found this free app on Google Play named USSD/MMI Fix. I would try this if I were you.

Link: click here

Please let us know if it works for you. Good luck!