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I'm communicating with my ZTE MG2639 module through UART. Few seconds after powering it and getting +CPIN and +STKPCI it just turns off (goes to stand by mode)

It only happens with SIM card, and after sending PIN.

What's wrong? I have tried on few different SIM cards and antennas.

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  • \$\begingroup\$ I´m starting to use ZTE MG2639_V3, and I no have problems with serial communications, I have problems to connect GPRS. Your project with MG2639 module is OK ? I would like to share some ideas with you. \$\endgroup\$ – user62722 Jan 5 '15 at 16:30
  • \$\begingroup\$ I have found what was my problem. It looks like this module is draining huge current in quick burst and my power supply is to slow for that. I have added 1 cell LiPo and it's working like a charm! Thank you for your answer though. \$\endgroup\$ – Ekci Jan 5 '15 at 20:18
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I have found what was my problem. It looks like this module is draining huge current in quick burst and my power supply is to slow for that. Adding 1 cell LiPo did a trick.

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