Make sure your SIM card is unlocked, GPRS Shield doesn't come with ESD precautions. Take special care when handling it in dry wThe factory default setting for the GPRS Shield UART is 19200 bps 8-N-1. (Can be changed using AT commands).eather,
Hook your Arduino up to GSM/GPRS cell phone network with GPRS shield! You can use your Arduino to dial a phone number or send a text to your friend via easy to use AT commands now. This new version features a quad-band low power consumption GSM/GPRS module SIM900 as well as a compact PCB antenna. Meanwhile, improvements on interfaces and basic circuit have been taken to make it more concise and reliable.
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