Since you have an 8703e (for which 4.2 is not yet available), you might be better off just asking your provider to temporarily reactivate your previous phone and leave your BB at home. This, of course, assumes you still have your previous phone.
If you can't do that and you're on BIS Only, you might try modifying your filter settings so that messages aren't forwarded to your device. That should minimize any potential data charges.
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