I used a variation on this in lollipop. I created a new home page, then went to the contacts widget which has 3 separate options: full contact, phone number, or message. I moved the phone number contact widget to the new home page. When I moved it, the system asked to search for a contact, then once a contact was selected, allowed me to select one number for that contact. I repeated this procedure until the new home page was full of my favorites (16 in total). They can be re-ordered in any way just like you re-order app's on a home page. Each one is a "one touch speed dial" to whichever contact and number you selected. If you want to change either the contact, or the contact's number dialed, you just drag the icon to the trash and repeat the procedure with the newly desired contact/number. Since all my contacts have pictures, it's a great custom one-touch speed dial page.