What Is Tri-Band Wireless?
Cellphones have become an essential part of modern society. These devices rely on cellular networks that operate and different bands or frequencies. To overcome compatibility issues resulting from these varied frequencies, some cellphone manufacturers make devices that can operate on multiple bands. Commonly available multi-band phones include dual-, tri- and quad-band models.
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Tri-Band Phones
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Global systems for mobile communications cellular devices operate at 850 and 1900 megahertz in North America and 900 and 1800 megahertz in most other parts of the world. Tri-band phones generally allow for use of both bands in the home region and also can operate using a third band in another region. For example, a tri-band phone sold in the United States would typically operate at 850 and 1900 megahertz and also operate at either 900 or 1800 megahertz.
Networks
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GSM is the cellular technology standard used in most of the world. In the United States, cellular phones use either the GSM standard or the alternative code division multiple access standard. Tri-band phones use the GSM technology. GSM is an open digital cellular phone system that requires the use of a subscriber identity module. If you plan to travel with your tri-band GSM device, make sure that the third band functions in the region where you'll travel.
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Access
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A primary benefit of most GSM phones is that you can change your phone’s SIM card when traveling. This allows you to purchase pay-as-you-go SIM cards while traveling for your tri-band device and avoid paying expensive international roaming fees. This doesn't apply if your cellular service provider has locked your SIM card. In this case, you can change the SIM card only by unlocking your device. Many of the phones supplied by service providers in the United States have SIM card locks and won't work in other countries unless a roaming agreement exists with a cellular service provider in the other country.
The Phones
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When using a tri-band phone, your device will automatically change frequencies as needed. You won't notice a difference between frequencies when using the device. Additionally, these phones can change frequencies during a telephone call. This allows you to seamlessly transfer calls between cellular towers operating at different frequencies. Therefore, a tri-band phone can benefit you both domestically and in situations where you want to travel abroad.
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