Have you ever had to miss an important call during a phone conversation? If Yes, then you will appreciate the advantages of using the second line. When you receive a call while making call, you will hear a tone and can answer the call without interrupting the current conversation.
To use two lines during a telephone conversation is possible with the option "call Waiting" is activated via the phone menu. Most mobile operators, this service is free, but just in case, check this point by contacting the customer service of your operator.
2
The option "call Waiting" is executed via phone menu to call settings, and for most phones will not differ from the following examples. So, Nokia should enter the menu, then select "Options" - "Call" and to activate "call Waiting", and to enable this same option in iPhone, open "Settings", go to "Phone" and enable "call Waiting".
3
Once the option is enabled, at the time of the telephone conversation you will hear a beep informing you that someone else calls you. Looking at the display, you can activate the incoming call without interrupting the conversation on the current line.
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See also
What do you mean "this type of connection is not available for subscriber"
How to configure "missed call" on the MTS
How to activate the "missed call" on the Body-2
How to send a dialler with MTS
As for MTS to connect to the service "missed call"
How to set call forwarding
Why the phone may not be available
As for MegaFon, ask them to call back
How to configure forwarding from phone to phone
How to configure forwarding to a single number
How to call a subscriber
As the subscriber of MTS to call for friend's expense
How to call for friend's expense
How to ask to call back to the MTS from the other room