How to activate STK on Quectel EC20 GSM Modem

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command, Am using Quectel EC20 GSM Modem (4G), i try to access SIM ToolKit to recharge on M1 SIM (Singapore).i know i need to activate STK.

 i tried `at+stgi=0` but it return `ERROR` 

any idea how to start with this

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Anto sujesh On BEST ANSWER

To activate the sim toolkit on Quectel EC20 GSM Modem (4G) you have to use below code which is not in the manual.

AT+QSTK=1,0,300

AT+QSTK=mode,alphabet,timeout

Mode
0 Disable STK functionality
1 Enable STK functionality

Alphabet set.
0 GSM character set
1 UCS2 character set

Timeout for response in second 1-300-65535