C650 - quad band? or whatever I need... I know nothing about cell phones - but, I need a quick question answered, please. I was going to get Cingular family plan, two phones, one year. I have a Motorola C650 that...is, uh, for my Grandma that I thought I could use as the third phone. I can unlock it, but...problem is, it doesn't support a frequency that Cingular uses...whatever frequency that is, once again, cell phone illiterate. So, the guy at the store tells me he can reflash it ( C650 ) to add that frequency and it'll work alright then. True, false? Thanks so much!