What is a Call Back ?
In the SIM card is used the technology making an outgoing call Call Back, which allows significantly reduce the cost of roaming calls.
Her essence is that at commission of an outgoing call there is an interruption of a call and at the same time transfer of a special signal to telecom operator.
And after this operator calls back the subscriber and connects it to where the call is made.
For the subscriber it occurs imperceptibly and quickly:
- dialing phone number
- communication break
- in 3-5 seconds on phone the call arrives
- the subscriber answers to a call and occurs connection.