> Any tips on moving to a pay-as-you-go plan that lets me keep my phone number?
DO NOT cancel your account!
call the new company, say you want to port your number.
the system is F*up... you will have to give the new co your account number AND PASSWORD for the old one. so if it is your SSN as it is by default, change it before if you care (or stop believing that SSN is secret, you are a grow up).
anyway, i cancelled ATT and then ported to TMOBILE. ATT was obliged by law to reactivate my account to complete the transfer... but that didn't hold them against mailing for a NEW 2yr contract and cancelation because i "hired" the service again... costed me a couple calls to short it out since they can't charge you.
anyway, the system sucks. read online and follow the steps. i had lots of headache for not following the dumb non-sense crap.
be a happy sheep. and good luck.