Use call waiting
Get another call while you're already on one? Call waiting helps you answer or hold one of the calls.
Tap Settings > network+, and switch Call waiting to On
1. To hold the first call and answer the new call, tap ANSWER.
2. To end the first call and answer the new one, tap end call+answer.
3. To ignore the new call, tap ignore.
Hold one call and make another
Tap HOLD, ADD CALL, and call the people you want.
Switch between calls
Tap TAP TO SWAP on the top of the screen.