Hello, This is my first post here. Greetings to all! I have an iPhone 3GS that I purchased 2 years ago but didn't use much due to various reasons. I jailbroke ios 5.1.1 with redsn0w, and subsequently 3G stopped working proerly. When I turn it on it appears briefly but it switches back to Edge 2G. If I only leave edge 2G on, that works properly. My baseband is 5.16.05 and I believe it is new bootrom device. I read on some websites and forums that I have to unlock it using ultrasn0w. But my baseband is not supported and I have to upgrade to ipad 6.15 baseband, they say. They say doing so may cause GPS to stop working properly. At the same time I see some places it describes ways to downgrade the bb. Why is it necessary at all? Could you please help me? I have searched everyone and at the end am thoroughly confused esp. with this baseband thing. How can I get 3G to work? I live in India and know it works here because others are able to use it with the same carrier and even I was, prior to jailbreaking. Thanks in advance for suggestions. Kind regards.