15Mute callWhen no sound wants to be heard by your interlocutor when you areon a call. You can choose the Mute function to do so.* End callUnder a circumstance of multi-party call, you can end up one of themby selecting this function.* Swap callThis function is available when you have both active and held calls.Swap transfers the active call to hold and vice versa, so that you mayconverse with the other party.* Hold callThis function allows you to put a currently active call on hold, so thatyou can initiate a new call.* Unhold callOnce you end the new call while holding an old call, the old call can bemade active again by selecting this function.* Join callThis function can let you make a conference call.* Private callDuring a conference call, you can use this function to talk privatelywith one participant.* MessagesYou can read or write messages under this function. Please refer topage 21 for details.6.13 Key LockYou can long press key to initiate the key lock function.Press key to confirm and activate. To unlock, press key and thenpress key.