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You recommend T-Mobile and Cingular for the Matrix GSM Module. Nextel and AT&T Wireless also offer SIM cards will those work?

April 26, 2017Cingular GSM matrix module Nextel Offer recommend T-Mobile Wireless

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You recommend T-Mobile and Cingular for the Matrix GSM Module. Nextel and AT&T Wireless also offer SIM cards will those work?

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No. While AT&T and Nextel utilize SIM cards, they do not support GSM circuit switched data, which is necessary for real-time data transmission. (AT&T Wireless has recently merged with Cingular, which may result in network changes.