To decline a call and send a message, Slide up to reject with message.
Tap the desired message. Note: To create or edit text message replies from the home screen, tap > Phone > Menu icon > Settings > Quick responses.
To make a call, from the home screen, tap the Phone icon.
Tap the Keypad icon.
Enter the Desired phone number.
Tap the Call icon.
While a call is active the Call icon will be displayed in the Notifications bar. Note: Visit the AT&T International Calling website for help making calls to or roaming in another country.