Yesterday I took my Giffgaff sim out my Blackberry, and put it into a Nokia E72, when i took the sim out the Nokia i put it back into my Blackberry and I had good signal all the bars were there, and it said Giffgaff on the screen. However when I try to call someone it says "Call forwarding conditional" and the disconnects, I cant text anyone, and when I try to send someone a message on BlackBerry messenger it does not send and has a red cross come up, I have credit in my phone, I cant seem to figure out what the problem is! Help!