I have a
(818) 123 4564
818 - 123 - 4567
If you know that the field contains a phone number in some kind of valid form, then the following really ugly usage of LIKE would match a specific number. To find 818-123-4567:
select * from thetable where phonenum like ('%8%1%8%1%2%3%4%5%6%7%')
This, of course, would match invalid entries as well (e.g., numbers that had extra digits, characters, etc.). And it would likely be a fairly expensive query unable to use any indexes.
A more realistic version might be this:
select * from thetable where phonenum like ('%818%123%4567%')