Boris Landoni draws our attention to the GSM GPS shield for Arduino designed by Open Electronics. “The shield is designed and based on the module GSM/GPRS SIM900 or the GSM/GPRS & GPS module SIM908, to make calls, voice and data connections via GPRS. This new version has several new hardware features, that allow maximum customization and provide many configurations. With a microphone and a headset with a 3.5 mm jack (just the standard headphones for computers), you can make a voice call from Arduino!”
For more details and library download links see the Open Electronics website. They are also making a kit version available from the Open Electronics store. (Note that the kit does NOT include the GSM/GPRS or GSM/GPRS & GPS Breakboard included in the photo above, which they sell separately.)
Via the contact form.