If your iPhone was jailbroken there is a tweak called "HomeScreen Contacts".
It allows you to choose any contact and make an SpringBoard(home screen) icon for it. It uses the contacts's picture as the app icon.
Using it is easy.
Open the Phone.app, tap on Contacts.
Locate the contact you want add and open it. At the bottom of the screen a new button is put there by the tweak that says "Add To Home Screen".
Tap that button, and the contact is added to the home screen as a SpringBoard icon.
Tap the icon, it open like a folder. There you will see 3 buttons. A "call" and "Send Message" and a home button...which is the contacts email address if there is one.
An alternative to "fast calling" would be to use a tweak called KuaiDial.
Once installed its super charges the stock Phone.app.
Open the Phone.app, and type in any name into the Dial pad (T9 functionality) and whatever letters you type the correct contacts name will show. If the contact is not rite, just swipe across the number to reveal other contacts that also have the corresponding letters that you typed in. Plus it remembers what numbers you call most often, so the more often you call a number the less letters you have to type into the dial pad.
Another alternative tweak for "Fast Calling" would he a tweak called CallBar..that also needs I have Actjvator or QuickDo installed to work. Activator and QuicDo are tweaks that allow you to assign literally any swipe, tap, double tap, 3 finger drag/swipe/hold, or button press to do literally whatever action you want.
Anyway...with CallBar, just open QuickDo/Activator and then tap "Anywhere".
Then choose whatever gesture you want. There are so many to choose from. I use center hold.
I tap and hold on the very bottom edge of my screen on the center and this pops down:
I Tao the dial pad icon and this pops down:
I tap the Contacts icon and the contacts list slides up.
Can activate the quick calm dialer from literally anywhere...in an app...on the SpringBoard...on the lock screen. Like this:
And believe it or not..this is the contact list on my "lock screen" after tapping the Contacts icon:
These tweak are awesome.
But as I said...you must be jailbroken to have such functionality.