First you will have to get your T-Mobile BlackBerry "unlocked". Contact T-Mobile and tell them you are moving and you need to have your BB unlocked.
Then, make sure you new Telstra account has BlackBerry Data Service included. Does Telstra support BWC? Are you going to be using BES or BWC? If BWC, then make sure that T-Mobile releases the PIN/IMEI on their BWC and you can have it registered on Telstra's.
It can be done - but get the BB unlocked in the first step.
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