Want to answer an incoming call during an ongoing call? It's called call waiting. It's easy, but you need to turn on call waiting before you can use this function.
When you have an ongoing call, the new call is indicated by a sound signal and a call waiting menu is displayed. Tap Answer Hold Current Call. The new call is answered and the active call is put on hold.
Tap swap to swap calls.
Make sure the call you want to end is active. Tap End. The active call is ended and the call on hold is automatically activated.