There were many speculations about GeoHot having iPhone 4 unlock  for baseband 2.10.04 and 3.10.01 and he will release it after iOS 4.3   release with the name Rubysn0w. But GeoHot has declined all rumors to   rest by saying “i don’t have one”.
GeoHot confirmed this news in a comment on his blog: 
I wish I had an iPhone unlock, the simple BB holes appear closed (my fuzzer comes up blank). In fact, I’m still using my 3GS cause I don’t have one :-/
GeoHot is busy nowadays fighting against  Sony, and recently he revealed  that he will Jailbreak/ Hack Xperia  Play Phone when it gets release.
But still there are hopes for unlock of  iPhone 4 baseband (BB) 2.10.04 and 3.10.01 because iPhone Dev Team are  working on the unlock of iPhone 4 BB.
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