04-25-2010, 07:26 PM
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SIM cards typically come from a mobile service provider that uses a GSM network. In the US, the major carriers would be TMobile and AT&T.
You would need to contact those carriers and see what type of phone service plan you want to sign up for depending up your needs.
If the device is unlocked (or if you unlock it), then it can be used with other GSM carriers. Be aware that AT&T will require you to have a data plan with a BlackBerry activated on their network.
The device can NOT be used with a CDMA carrier such as Verizon.