Nokia phones that feature two subscriber identity module card slots are designed to give users the option of assigning and using two phone numbers in association with the same phone. Known as dual-SIM or double-SIM phones, they can help save on long-distance calling charges if the phone is used in multiple states or countries.
Technology
As stamp-sized microchips, SIM cards contain vital personal information, such as your phone number, account number and name, which identifies the phone to your wireless service provider. SIM cards are compatible with Global System for Mobile Communications technology, typically used by T-Mobile and AT&T. Dual-SIM and double-SIM phones, such as those offered by Nokia, are only good for cellular calling and sending and receiving multimedia messages that support text, picture, video and voice content. SIM cards are also interchangeable with other mobile phones, making it possible to transfer contact information saved to the SIM card to another mobile phone.
Double vs. Dual SIM
A double-SIM phone, such as the Nokia C1-00, supports two SIM cards and two phone numbers, but you must switch between the two cards to use the desired phone number. Dual-SIM phones, such as the Nokia C2-00, allow you to place and receive calls and send and receive messages at the same time without needing to switch between cards. These types of phones are low-end models, however, offering only the basics of cellular technology.
Provider
Using a dual- or double-SIM card Nokia cellphone to its fullest requires activating both cards with your wireless service provider. If you plan to use the phone in your direct service area, the phone numbers will be in the same area code. However, if you intend to use the phone in multiple parts of the state or country for business purposes, your provider can assign phone numbers in different area codes. Because long-distance calling within the United States is largely irrelevant when using a mobile phone, these types of phones mostly benefit people using the same phone where there are long-distance fees for international calling.
Considerations
Although dual- and double-SIM Nokia phones offer some benefits, most of them lack the features commonly offered by mobile devices on the market at the time of publication, such as access to 3G and 4G wireless networks and navigational functionality. The Nokia C2-00, however, does come with a few of the high-end features offered by other mobile phones, such as a built-in digital camera and Web browser.
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