Currently Being ModeratedApr 30, 2013 1:16 PM (in response to James Cacabelos)
To completely remove it, you would have to restore your phone.
I've read in other threads that in due time, the number will eventually get deleted.
A work around is to use symbols or just other letters for that number, so that way when you type the name it won't show up.
Currently Being ModeratedApr 30, 2013 1:17 PM (in response to James Cacabelos)
Unfortunately you can't unless you restore your iPhone without loading your backup (i.e. set it up as a new iPhone completely). This is a known issue, let Apple know your thoughts on that here: