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TIA TR-45.2 assigned ranges to every country in the [[1980]]'s and national regulators assigned individual numbers. [[IFAST]] took over in [[1997]].
This number space is 90% utilized, however many countries do not use all of their allocated codes.
SID is assigned by [[IFAST]] to every carrier(e.g., Verizon, sprint). SID is programmed into the phone when you purchase/buy a plan.
When the phone is powered ON, it listens to SID. If it receives an SID, it compares with the one that is stored in the phone. You have service if there is a match. Else you are "roaming"
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[[Category:wireless communications]]
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