Review on Wireless Quad-Band GSM/GPRS/GPS Shield Based On SIM808 Onboard CP2102 MIC29302 Phone Talk Speaker Module @XYGStudy by Mark Jefferson
Worked fine for 4 months and died.
I wore the device sitting down for about 4 months with occasional use on a stable power supply. Unfortunately it suddenly doesn't seem to work anymore and doesn't show up in dmesg or /dev/ anymore.
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