Arduino devices have had the option of a GSM linkup for awhile, but getting that cellular link to truly strut its stuff hasn't always been easy, even for those of us who'd be inclined to program ...

Stacking GPS, GSM, And An SD Card Into An Arduino Shield 18 Comments by: Brian Benchoff October 19, 2012 ...

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.