I did a search, but still don't have a clear answer. Can I unlock Verizon iPhone 4s so that it can be used in TMobile network?
Verizon iPhones can not be used with SIMs from US GSM providers. They can only be unlocked to use SIMs from non-US providers.
It may work if you got a Tmobile SIM from Europe...
Actually now they can with a r-sim iii it cost around 15 bucks
I've heard of those... but also seen lots of issues with it as well. If one wants an iPhone on Tmobile now, they'd be better off starting with an unlocked AT&T phone than trying to mess with a Verizon one... or, just wait until Tmobile gets their own iPhone... rumors are it's coming.