i have been loking into the socialite 40 plan, but have never used pay-as-you-go and am a little confused. so do you just make sure you have a balance of at least $40 on your phone each month? does any extra money carry over from month-to-month (like, can i put $100 at one go in case i forget the next month?), and do i get any form of billing? and what happens if i do forget to put money on one month? also, any issues with rogers? am thinking of getting samsung corby plus. thanks