Originally Posted by JSanders
Your PIN, on each and any BlackBerry is found at Options > Status... or on the white sticker underneath the battery.
Remove each other's pending contact from BlackBerry Messenger. Delete the pending contact. Then do a reboot of the device, with the BlackBerry powered ON, remove the battery a minute and replace it to reboot.
After getting back running, you can go to your Messages folder > Compose PIN and test sending your friend a PIN message. Does he receive it? Does it show a D beside the message for Delivered?
Now, add him back, or vice versa, but both of you do NOT need to add the other. Just add him and let him accept it. Add him via his PIN number.
i'll try right away, thanks a lot for your answer!