No call-back

TezGSM -

If when you dial a number and press "Call", the callback does not come within 10 seconds, or an error is shown, try again. Perhaps the connection was broken due to a malfunction in the communication channel. Check also the opportunity to dial through the prefix *146* (the example of calling to the number +3725123123 - *146*003725123123#). If in this case there was a dial-up – your phone is of old model and does not support the callback function in a standard way. The outgoing calls will work through the prefix. If you can not dial through the prefix *146*, too, you need to change the operator manually and try again to dial through the prefix. If the attempt is not successful, you must complete the application and send it to the TezGSM support service.

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