I recently bought an iphone from a friend, I unlocked it and was running yellowsnow and it was all good. it had one problem though the home button would stop responding sometimes. so the warranty was nearing its end and i took it back and got a shinny new one. freaking awesome right? wrong! I had not done my homework. I took my greedy little self in there and walked out with 2.2.1 now i am freaking out....i jailbroke it,unlocked and downgraded in right away, but of course the baseband 02.30.03 (like I'm sure all of you who do your homework on this stuff know) I just installed yellowsn0w and it's not working and I'm pretty sure i am screwed. I just read... its all bad. does anybody have advice or any direction. Is the only thing that i can do is buy a sim chip or something? please let me know..........I can't call anybody and it sucks