Can a smartphone that can use 2 sim cards use 2 different providers at

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MrseWinterbourne

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the same time if unlocked? I just bought an unlocked smart-phone online, and a thought just occurred to me. Can I install an AT&T sim and a T-mobile sim at the same time and have them both work? I know they are on different frequencies, I just wondered if the phone could monitor both frequencies at the same time?
 
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