To make a call, from the Start screen, tap the Phone tile.
Tap the Dial pad icon to get to the phone’s dial pad.
Dial the Desired number, then tap call.
To answer an incoming call, tap Answer. Note: Alternatively, when answering a call from the lock screen, Swipe up.
To decline an incoming call, tap Ignore.
To reject an incoming call and reply with a text message, tap Text reply.
Tap the Desired message to send it. Note: To create or edit text message replies from the Start screen tap > Phone > Menu icon > Settings > edit replies.
When connected to a call, the active call information will display in the notification bar. Tap to return to phone function. Note: To learn about calling or using your device in other countries, visit the AT&T International Calling website. http://www.wireless.att.com/learn/international