I encountered a couple of minor issues (aka learning curve) with this shield. https://www.sparkfun.com/products/9607

The documentation doesn’t clearly state the poewr requirements (not that I could see anyway) so I hit a small snag due to low power. However, once I resolved that issue everything started working instantly.

• The cellular shield will draw MORE current than can be provided by USB alone. You MUST plug the Netduino into a power supply, otherwise the Cellular Shield won’t work, and you’ll waste hours trying to get it to do so.
• The version of the Shield I received seemed to differ from the Schematic I downloaded. It did not have any jumpers.
• The version of the Shield I received was hard-wired to use D2 and D3 for serial comms at 9600 baud - some people have reported their modules were configured for 115200, so beware!