A SIM card is used only when you are overseas and you need to connect thru a GSM or other CDMA network. It serves no other purpose. My 8830 has a SIM in it only in those circumstances. Here in the states I have access to all of the whistles and bells without a SIM. It is used only for global roaming. It has nothing to do with an SD card. Re: pg. 33 of the 8830 manual published by Blackberry. I hope you find this information useful.
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