If you never heard about R-SIM unlock before, this unlock solution is already able to unlock baseband 2.0.10 For iPhone 4s On iOS 5.1 using their 3rd generation hardware.
To those iPhone users who have been stuck in baseband 4.11.08 for months and desperately seeking for the unlock solution of their modem firmware can now show a happy smile on their faces. Now you have a hope. And below is what R-SIM developer says about.
Apparently it is not easy to unlock iphone 4 baseband 4.11.08, but at this time we have at least 50% to unlock the iphone 4, so we still need 1 week more or less to improve the program, and please stop sending email to us, just add our facebook page or twitter or keep an eye on our site, we will update the info once it is available,
Also it is not a April joker.
And there is no detail information on how R-SIM IV works to unlock the baseband, whether it will require to dial international emergency call 112 or automatically like CutYourSim.
If you are interested you can head to their official website to study more or to make a pre-order and the shipping is free.
Update: There is a good news for AT&T iPhone on baseband 4.11.08, because from now you are able officially unlock it using AT&T online chat. And if yours is a jailbroken AT&T iPhone, head to this post to officially unlock it and keep your untethered jailbreak on baseband 4.11.08.