![]() ![]() ![]() They are especially useful for frequent travelers who want to use their phone abroad without paying international roaming charges. Prepaid SIM cards are a good option for people who don’t want to be tied to one carrier with a long-term contract. SIM cards are tied to a particular service provider (carrier) and can only be used with a service plan from that carrier, either with a long-term contract or on a prepaid or month-to-month basis. If a particular user hasn’t paid his or her phone bill, the carrier can stop service to the device. It’s also how a phone bill can be attributed to a particular device, based on usage. That code contains information about the carrier, country of origin, and a unique user ID. You may have wondered what the long code printed on your SIM card's microchip is all about.
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