already? Ok, I had an HTC tilt 2 for ATT but i dropped it and it broke. So my sister gave me her old iPhone that she no longer uses, to use. i restored the iPhone and put my sim card in. (which btw i already have a plan for e-mail/web and unlimited sms that im paying for) when i went on itunes i had to give billing address and 4 digits of ss# just to activate the iPhone. then after, i clicked continue it said i have to change some stuff for my plan.. like pay $20 for unlimited txt. which is what i already have on my plan. soo it seemed to much trouble and confusion to continue.so my question is HOW DO I SIMPLE PUT MY SIM CARD INTO THE IPHONE, TURN IT ON, AND USE IT LIE IT IS ANY OTHER PHONE. W/O HAVING TO CHANGE MY PLAN???