C a l l f u n c t i o n s25■ Options during a callMany of the options that you can use during a call are network services.For availability, contact your service provider.To increase or decrease the volume during a call, press the volume up ordown key on the side of the phone.Select Options during a call and the following options may be available.Send DTMF — to send tone stringsSwap — to switch between the active call and the call on holdTransfer — to connect a call on hold to an active call and disconnectyourselfConference — to make a conference call that allows up to five persons totake part in a conference callPrivate call — to discuss privately in a conference callDo not hold the device near your ear when the loudspeaker is in use,because the volume may be extremely loud.