In other words, you can build your own unlocked phone with it. The device can be shipped along with Arduino’s Uno, MEGA, and Leonardo boards, and the GSM Shield itself comes with a SIM card.

These days, most of us have a smartphone. They are so commonplace that we rarely stop to consider how amazing they truly are.

If you're sick of using your boring old keys to unlock your door, Make has a guide for using and Arduino to power a lock that you can control with you ...