I have an ipad2 with wifi. I can usually connect into my friends' wifi, using their key codes. One friend has a laptop and iPad connected with a Talktalk wifi system. I can pick up his signal but it will not allow me to access it and doesn't request a key code to allow me access. He is a silver surfer, as am I, and he doesn't know why. Is it something he did when he set his wifi system up?