Dual band mobile phones can work on networks that operate on different frequency bands. This is useful if you move between areas covered by different networks. Some networks operate on two bands, for instance GSM-1800 in town centers and GSM-900 in the rest of the country.
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A mobile that can support two different frequency ranges, such GSM900 and GSM1800. Three band mobiles, supporting GSM1900 too, are also available. Compare with dual-mode - a mobile that can support two different technologies such as analogue and digital.
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http://www.encyclo.co.uk/visitor-contributions.php
A phone that can use both 900MHz and 1800MHz networks. In the UK, Orange and T-Mobile historically used the 1800MHz frequency while O2 and Vodafone used 900MHz. As the airwaves have become more congested the networks are using both frequencies and nearly all new mobile phones are at least dual-band now. See also
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http://www.tuffphones.co.uk/glossary
Ability of a phone to work on both 900MHz and 1800MHz networks. Historically in the UK, Orange and T-Mobile used the 1800MHz frequency while O2 and Vodafone both used 900MHz but as radio airwaves became more congested all networks started using both frequencies and all new mobile phones are now at least dual-band.
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https://www.encyclo.co.uk/local/21186
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