Usually we use such combinations when requesting balance information, the period of action, when the account is replenished, etc. When performing more complex requests inside the code, an asterisk is used to separate the parameters. It starts with an asterisk and ends with a grid. The MMI code (Man-Machine Interface) is used to form a USSD query from a mobile device keyboard. There is nothing difficult in them and even an inexperienced user will be able to fulfill them. If you try to make a call when trying, send an SMS or make a request for the account balance on the phone screen, the connection problem is displayed and invalid MMIYou should make simple manipulations to restore communication.
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