To adjust the volume during a call, use the volume key on the side of your device. You can also use the scroll key. If you have set the volume to Mute, select Unmute first.
To send an image or a video in a multimedia message to the other participant of the call, select Options > Send MMS (in 3G networks only). You can edit the message and change the recipient before sending.
Press the call key to send the file to a compatible device (network service).
To put an active voice call on hold while answering another incoming call, select Options > Hold.
To switch between the active and the held call, select Options > Swap.
To send touch tone strings (for example, a password), select Options > Send DTMF.
Enter the touch tone string or search for it in Contacts.
To enter a wait character (w) or a pause character (p), press * repeatedly.
To send the tone, select OK. You can add touch tones to the phone number or touch tone fields in a contact card.
Tip: When you have only one active voice call, to put the call on hold, press the call key. To activate the call, press the call key again.
During an active call, to route the sound from the handset to the loudspeaker, select Options > Activate loudspeaker. If you have attached a compatible headset with Bluetooth connectivity, to route the sound to the headset, select Options > Activate handsfree.
To switch back to the handset, select Options > Activate handset.
To end an active call and replace it by answering the waiting call, select Options > Replace.
If you have several calls active, to end them all, select Options > End all calls.
Many of the options that you can use during a voice call are network services.