HERE'S A TIP: For annoying frequent calls (ie debt collectors) to your cell phone you could save the numbers that call and assign them a unique ringer ID to ring as 'Silent'. So you'll get the call but it won't ring your phone and bother you. Then instead of getting annoyed or frustrated you can just laugh. Sure it seems they call from a million numbers but after a week or two you'll have them all saved and silenced. (ps. I ran into an old Nokia phone with no Silent setting so possibly you could just create your own ringtone with just of couple "pauses".)