Roaming defines the use of wireless service outside a wireless subscriber’s home service area. In other words, wireless customers are in a roaming state when they use their mobile phone outside of the general area where they originally purchased their wireless service. Each wireless carrier determines its own home service area on the basis of the specific market where they are operating. In each market, one carrier may try to maintain a larger home area footprint (coverage area) in order to gain a competitive edge over its in-market competitor. The home service area may be designated on a large wall map in sales offices where service is initially obtained by wireless subscribers.
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