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[Q] How do the gsm/umts/lte/cdma technologies work with frequencies?

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By aiizawa, Junior Member on 8th July 2014, 09:41 PM
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Why do certain phones support just specific bands for each technology, gms/lte/umts and the like? I don't see why the phone cannot just recieve signals from a range of frequencies then usuing different technologies to read the frequencies at each level. Like some phones support the 1700/2100 lte band but don't support the 1700/2100 on umts/gsm? Are the phones just locked for the different frequencies on those technology due to corporations?
 
 
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