Unfortunately this has been discussed before and it appears there is no way for a BES admin to do this. There are varying reports of the carriers being able to send a special command to program the SIM phone number however I am skeptical of this approach. I think it requires end user intervention at the device level.
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BESX 4.1.7 on Exchange 2003: 65 Devices
BESX 5.0.3 on Exchange 2003: 2007 Devices
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