I have an Android device "SKY VEGA IM-A810K" (Android 4.0.4) un-rooted. I'm not able to run any USSD code commands like balance check, etc. Every time it shows "connection problem or invalid MMI code". Please suggest some solution. In India we use *111# ; *141# ; etc on Vodafone network.

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    Could you give an example of the actual USSD code? Do it have it in the correct format? Ex. #646# #225# Here is a list of USSD codes – user24200 Jul 24 '13 at 18:25
  • How are you running the commands? Typing them on the dialer, and dialing? – geffchang Aug 10 '13 at 16:35

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