Originally Posted by penguin3107
You SIM card had a data plan (or T-Mo Feature Enabler) provisioned on it. It's clear that your sister's SIM card does not have this.
This. The bolded part. MMS on Tmo does not require data, but requires the feature enabler (thats how it does mms without a service book or data)
The feature enabler is PER LINE
, not per device
Contact tmo, ask for the mms for blackberries enabler to HER
You are explaining yourself just fine, you just aren't listening to the answer