The GSM Shield also includes a Telefonica SIM card that includes a worldwide data tariff which can be used anywhere there is a cellular signal. Features include the ability to have the Arduino ...

It comes with either an Arduino board or the Cinterion EGS5 kit that is designed for developing prototypes in industrial scenarios. Developers who already have the hardware required can order the M2M ...

In the meantime, another add-on that brings 3G and GPS to Raspberry Pi or Arduino is available at Cooking Hacks for €189. There's also a cellular add-on for Arduino for $99.95.