Hey there,
I know this post is a few years old, but I work for Symmetry Electronics, and we are a franchised distributor for Telit.
Symmetry can sell the Telit devices, along with many related components (antennas, MCUs) that you might need.
I have also helped to create a document with different Network Operators that can get a device up and running on a cellular network:
If you have any questions, feel free to contact Symmetry and someone there will be happy to assist.
-Brian