I think you guys are missing something (it's confusing I know!
I have nothing to do with Jim. I only have one PIN contact and that is Bill.
Bill has added Jim's PIN to his contact list.
My PINs are going to Bill correctly - they are not going to Jim.
I asked Bill to double check his contact listings for Jim and me, and he said they are correct.
So I sent a PIN to Bill. He got it and replied. I got his reply okay. However, in his reply is my original PIN shown as inline text, and the To: field shows Jim. It's almost as if HIS Blackberry is calling his own identity as Jim instead of Bill. Even though the PINs are correctly going to him.
For what it's worth, I have a Pearl on T-Mobile, and he has an 8830 on Verizon.
The only other thing I thought about was for him to reboot his device & let me know so we can test it again.