It won't work. The Tour is a CDMA device and ATT is a GSM carrier. two completely different technologies in play here.
Your best bet is to wait for a Tour equivilant to be released by a GSM carrier. Then you could get it unlocked for use with ATT.
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1st Step in Troubleshooting: Do you have a BlackBerry Data Plan?
2nd Step in Troubleshooting: Pull the Battery.
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