Wirelessly posted (Curve 8310)
I've had this SIM rejected problem before, and it was before I ever upgraded. I'm not sure if it's the same problem you all are having, but all I did was pull the card and re-insert and it worked fine.
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8110 -> 8310 -> 8900 -> 8520 -> 9700 -> 9800 -> back to 9700
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