In North America SIDs are allocated by seven companies that applied to the U.S. Federal Communications Commission (FCC) for this privilege when the FCC ceased allocation of the resource.
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The SID lets mobile phones that conform to the TIA Cellular or PCS Standard analog, CDMA or TDMA standards recognize when they are in their home system vs. roaming or in another system that can provide them with service.
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This organization is the coordinator for the allocation of System Identification Numbers (SID) for wireless communication outside Canada, the United States and territories, and on the assignment of International Roaming mobile identification numbers (MINs), or IRM, for use in cellular mobile devices.