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•Digital unlock codes. Because cellular phones in North America are heavily subsidized, most carriers don't want to see a phone they spent hundreds of dollars on end up on some other company's network. Therefore, almost every digital phone sold in North America has a 6 digit programming lock code. Without this code, it's impossible to program a phone with a new new number or network settings. These lock codes are owned by the company which sold the phone in the first place. Bell also has a policy of not activating "foreign" handsets on their network. This type of policy is usually a standard part of a roaming agreement with another carrier.
•Software. Digital Cellular Phones are more and more like computers everyday. The software they have in them is specialized for the network on which they are to be used. If those phones are used on a different network, chances are they will not perform very well.
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