From a Home screen, navigate: Apps icon > Contacts .
From the Contacts tab (at the top), tap a contact.
Tap the Edit icon (upper-right).
Edit any of following then tap the Save icon (upper-right):
Depending upon the account type, the options presented may vary. To display more fields, tap More fields (at the bottom).
To add a pause (a 2-second delay between numbers) or wait, tap Pause or Wait (on the left side of the keypad).
To change phone type (e.g., Mobile, Work, ect.) tap the Dropdown menu (below the phone number).
To change date or date type (e.g., Birthday, Anniversary, etc.), tap the Dropdown menu (on the right).
SIP (internet calling)
To change group name (e.g., Friends, Family, etc.), tap the Dropdown menu (located on the right).