Samsung Galaxy S6 Edge: How to Use Speed Dial Feature in Android 5.1.1 Lollipop

Speed dial is a feature available in your Samsung Galaxy S6 Edge which will let you assign a contact to a speed dial number so you can easily call the contact simply by long pressing the assigned speed dial number in the keypad.

How to assign a contact to a speed dial number?
You have to assign a contact to a speed dial number before you can call that contact using the speed dial feature. As the example, we'll assign a contact to a speed dial number by using the following steps:

1. Open Phone app.
2. If the keypad is hidden, tap at the bottom right corner of the screen to show the keypad.
3. Tap More at the top right and then select Speed dial.
4. Tap + Add contact in the required speed dial number. 
5. Select the required contact you want to assign to the selected speed dial number.
6. The selected contact has been assigned to the selected speed dial number.
7. To assign more contacts to speed dial numbers, repeat from the step #4. FYI, you can assign up to 999 contacts to your speed dial numbers.

----------------------
Tips: It'd better if you place your important or favorite contacts in the top 10 or in the special numbers(e,g: 123, 555, etc) so you can easily remember in which speed dial number the contact you want to call is assigned with and save yourself from calling a wrong contact problem.
----------------------

How to call a contact using the speed dial feature?
If you have assigned a contact to a speed dial number, you can easily call the contact by using the speed dial feature. See the following steps to do so:

1. Open Phone app.
2. If the keypad is hidden, tap at the bottom right corner of the screen to show the keypad.
3. Call a single speed dial number:
   To call a single speed dial number, you just need to tap and hold the number. As the example, if you'd like to call a contact that has been assigned in the speed dial number 5. Tap and hold 5 on the keypad and the phone will automatically call the contact you have assigned in the speed dial number 5.
4. Call multiple speed dial numbers:
   To call multiple speed dial numbers, you have to enter the numbers and then tap and hold the last number. As the example, if you'd like to call a contact that has been assigned in the speed dial number 456. On the keypad, tap 4, tap 5, then tap and hold 6 and the phone will automatically call the contact you have assigned in the speed dial umber 456.