Go to the terminal and use this AT command to get an amount AT&gxx=xtd*101# and then after # you should use ; or without ; it depends on module. xx=is number of GSM module 00 means the first module.
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Go to the terminal and use this AT command to get an amount AT&gxx=xtd*101# and then after # you should use ; or without ; it depends on module. xx=is number of GSM module 00 means the first module.