Allo.com GSM Series User Manual - Page 7

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GSM Digital Telephony Card User Manual – Version 1.0

GSM modules and SIM cards

SIM cards work at the Quad-Band E-GSM/DCS/GSM850/PCS GPRS/EGPRS

900/1800/850/1900. One GSM module supports one SIM card and one

antenna, please plug a SIM card into the back of a GSM module and activate

it. For more details, please refer to figure 3 &4.

Figure:3 GSM Modules

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