GeekOnFire GPRS/GSM Shield
Photo credits: unknown
Shield URL: GPRS/GSM Shield
The GPRS Shield provides you a way to communicate using the GSM cell phone network. The shield allows you to achieve SMS, MMS, GPRS and Audio via UART by sending AT commands (GSM 07.07 ,07.05 and SIMCOM enhanced AT Commands). The shield also has the 12 GPIOs, 2 PWMs and an ADC of the SIM900 module (all 2V8 logic) present onboard.
Open Source: No, not OSHW-compliant
License: Proprietary / closed source
License Note: The design appears to be based on the Seeed Studio GPRS Shield, which is licensed CC BY-SA 3.0 and therefore requires source files of derivatives such as this one to be released. However, I could not find source files so it appears this maker is in breach of the original license terms.