With the BlackBerry Feature Enabler, you can:

- Send Picture Messages without a BIS/BES plan
- Use the OZ Messenger Instant Messaging Client (Uses SMS, so be careful)
- Allow you to use T-Zones Portal (Access their WAP homepage)

With the current $5.99 TmobileWeb Plan in addition to the BlackBerry Feature Enabler

-Use Opera Mini to surf html websites.
-Use Opera Mini to check email via websites
-Use JiveTalk for your instant messaging needs (uses data, and $5.99 Tmobileweb plan is unlimited data)
-Browse ANY wap site using T-Zones Portal

Without the BlackBerry Feature Enabler plan
-CANNOT send picture messages
-CANNOT browse T-Zones
-CANNOT use OZ Client