Open the Dial-up keyboard tutorial during the iphone call

　　Method One:

1, when in the call, the first step needs to click the "Add Call" button.

2, Next will display the Address book on the iphone, you need to click on the lower right corner of the "Dial keyboard" to continue.

　　

3, then you can see the dial-up keyboard, in which to add a new number to dial, as shown in the picture

　　Method Two:

1, continuously press the home button two times, open multi-task management background, and then click on the "Phone" application, as shown in the picture

2, then you can directly dial the keyboard, add a new phone number, as shown in the picture