Hi i had an iphone 3gs which i jailbroke no probs....Now i have just upgraded to iphone 4..it is ModelMC603C...Version 4.2.1 (8C148)...Modem firmware 03.10.01.....I have windows 7 my question is can it be jaibroken/ If so what is the best and easiest way to do it??? Thanks for any help......