Making Calls from iPhone:
After updating your contacts to your device, you can start calling.
Click the green phone icon. To open the keypad press the keypad icon
on the doc.Press the contact button to choose from your list of
contacts.
On recents button you can find recent in and out going calls log.
On favorites you can add your favorite's friends to a separate list.
* Silencing incoming calls:

While receiving a call you can silence your iPhone by tapping the
side volume button. If you want to send that call straight to your
voicemail double click on the top right iPhone button.

Next: i13.Receiving e-mails on My iPhone


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