Learn what features are available while on an active call.
INSTRUCTIONS & INFO
When you're on a call, the screen shows several call options.
To mute your line, tap mute. Note: To unmute, while muted tap mute.
To put the call on Hold, hold the mute button until it turns into the hold icon (about 5 seconds). Note: To take the call off hold tap hold.
To turn speakerphone on and off, tap speaker. If using a Bluetooth device, tap audio, then select the desired option; Bluetooth device, iPhone, or Speaker.
Tap contact, to open your contacts.
Tap FaceTime to make a FaceTimecall.
Tap add call, to make another call.
To end the call, tap the End call icon or press the Sleep/Wake button. Note: Learn more from Apple support article: iPhone: Understanding phone features