[JSanders]

The only requirement for PIN messaging is to be subscribed to a BlackBerry Data Plan, or on Tmobile, a generic data plan AND the Tmobile "Feature Enabler".

1. Can either of you PIN message another person (you are welcome to try and test me at PIN 241b581d if you like).

2. PIN messaging and BBMessaging work across carrier networks, across the world, with no restrictions OTHER than some BES corporate IT Policies might disable PIN messaging.

This would be the first thing... compose a PIN from the Message > Compose Pin screen. if that works, you should be able to use BBMessenger, as long as one has added the other as a BBM contact. BOTH of you might try deleting the other from your BBM contacts, wait a while and make sure neither is showing in your BBM Contacts, then one of you add the other.