Hi and welcome to the forum.
Nope, PIN is a unique ID for each Blackberry and in HEX Decmial format. The only thing your friend has to do is a Blackberry data plan, however, if he is already able to send and recieve emails, therefore he already has a data plan.
To test the Pin again, you can simply go to Messages from your BB and select Compose PIN. If you get a tick with a D next to the sent messages, therefore the messages has been delivered and both of your BB are good to go. If you only get a tick but no D, therefore the PIN is still with RIM and unable to deliver to the other BB due to either no receiption. If you get a red cross, open the message and scroll up to the top to see the error, then search for the error message at www.blackberry.com/support
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Feel free to search www.blackberry.com/btsc to find your answers.
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