Wirelessly posted (BlackBerry 8700g: BlackBerry8700/4.2.1 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/100)
You can leave it in. The upgrading of the firmware will wipe out the data on the BlackBerry, not the SIM card. You can take it out if you like, though. I do recommend making a backup of the BlackBerry prior to upgrading.
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