first post! someone is giving me an iPhone 3G tomorrow and i have some questions. not really familiar with the iPhone, but i have experience with the iPod Touch. -should i stay on ios4 or downgrade to 3.1.2/3.1.3? which performs better? is stuff like dtunes and custom boot logos ever going to get ios4 support? -i want to use it on T-Mobile prepaid using only the web daypass. what is the method i should use to unlock, and is there anything special i need to do to set up the iPhone to use with T-Mobile? i don't know the baseband for now if it matters, but i can post it when i get it. also, how do i completely turn off data for when i don't have the web daypass? -is there any way to downgrade without shsh blobs? -what is the best method to jailbreak on 3.1.2/3.1.3? thanks.