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Review Details

IComSat GSM / GPRS SIM900 Module Expansion Board Shield with Antenna For Arduino Mega

IComSat GSM / GPRS SIM900 Module Expansion Board Shield with Antenna For Arduino Mega

Product Review (submitted on June 22, 2015):
This is a rather good shield, but it has some problems:

1. Arduino library that is supplied on this site - does not compile as the library is outdated.
2. There is no AutoPowerOn - you need to press and hold SIM900-POWER button to actually power on chip (also to power down chip).

I think that you end up better using AT commands passed using software serial than using Arduino Library.