A contact can be saved on a number key and dialled by tapping and holding the key it's saved on. It's easy, but you need to save the contact on a speed dialing key before you can use this function.
Step 1 of 4
Use speed dialing
Tap Apps.
Step 2 of 4
Use speed dialing
Tap Phone.
Step 3 of 4
Use speed dialing
Tap the Keypad tab.
Step 4 of 4
Use speed dialing
Tap and hold the required speed dialling key until the number is called.