To try and help with this, [PTS93] developed the Stator library to make certain common tasks simpler to read. The aim of the library is to get rid of piles of state tracking variables and endless ...

[Rafael] just made a little library that allows you to interface these modules to the Atmega328p-based Arduino UNO in order to gain some memory space.

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.