RE #11
Sorry, I wasn't completely clear on what I was referring to, I meant new handsets when changing carriers. Some carriers will give you a "customer loyalty discount" which pretty much equates to the new customer discount, when you re-sign another contract, usually two years, after your first contract expires.
I don't know if cellcom is a carrier or just a provider, but if they have the best coverage for your area, you could try talking to one of their reps or a few web searches and find out who, if anyone, they are buying airtime from.
As for new handset, if you pull the battery cover off and read the stickers inside the phone, it should give you an idea what the specs (frequency & technology) are for the phone. Then you just get a compatable phone, and move the sim card (if any) and call the carrier and activate the new ESN.