UPDATE:
Unfortunately Deutsche Telekom M2M decided that they don’t want to support small developers and they took down my two tutorials.
Original Post:
At work I created a step-by-step tutorial on how to get started with the DevStarter Arduino Developer Kit. I used this Developer Kit to realize my plant and LED matrix demo.
This Developer Kit is available at the M2M Developer Community which is a part of the Developer Garden and includes an Arduino GBoard with a SIM card (activated for 6 month) and an own tenant for the M2M Developer platform (also for 6 month).