1. AC Question's Avatar
    I can't check the balance or top up my phone, every time I try to run USSD code, there is a message pops up: "Connection problem or invalid MMI code".
    I tried to google and used everything: adding "+" ot ",", manually choosing mobile network, restarting the phone, etc. Nothing helped.
    Did someone find a way how to fix it?
    05-07-2017 08:59 AM
  2. B. Diddy's Avatar
    Welcome to Android Central! Have you asked your carrier about this?
    05-08-2017 10:22 PM

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