93320 - I even remember when we got the phone installed in our home. My best friends number was 93310. Some years later a three digit area code was added.
I usually don't have a problem remembering phonenumbers, bank account numbers and codes. (A year after I got separated the eks had his wallet stolen, he had to call me from the police station to tell me what his bank account number was so he could have his card blocked.. Smart guy.) But then, I sometimes need a "pattern", once I couldn't remember the code for something - I normally entered it on a pad, so I had to draw it up in front of me..
Oddly enough, I never managed to memorize the Critters cell phone that he got 4 years ago. He got a new number two weeks ago, and that one I remember. It's something about the numbers and how they relate to each other that makes it easier for me to remember it..