Hello my name is basiru am from Banjul the Gambia. Ma question to you is that my iPhone 3G cannot download, if I click download the application will says that this apps require update iOS 4.2 or 4.3 please I need your help

Please what solution did you have for this thing?

Please help me how can I update it?

Some told to update it right is not safe, he told me if I update it at this moment it may get lock if the iPhone is not a factory unlock, well for me I don't know wether is a factory unlock because I bought the phone from some here in Gambia.

He futher told me that no jailbreak at this moment and he further said that is not safe too. Please help me I like apple so much.