From the very beginning !

[Britdog]

I'm waiting for a pay as you go micro sim to be delivered but it may be a while, snow & no post deliveries. So i have a crimbo prezzy iphone 4 which is from ebay which i need to verify is a good buy ? I'd like to go ahead & use it jailbroken but will i have to reset it when i get the sim ? Oh yes, how do I know what version of iphone i have as i cant get passed the 1st screen. Just to confirm what i think is required to start the jailbreak is knowledge of the hardware version ( firmware version ) & software version ? Thanks in advance for any advice