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?
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?
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