Have you seen the new increased speed HSPA+ (21Mbps download, 5.76Mbps upload) families of ready to deploy Embedded & Chassis Modems from MultiTech Systems?
These carrier pre-approved and ready for WW deployment products can be found here -
http://www.multitech.com/en_US/DOCUMENTS/Collateral/data_sheets/86002156.pdf
http://www.multitech.com/en_US/DOCUMENTS/Collateral/data_sheets/86002158.pdf
Need more information or want to chat about your application requirements just let me know.
Neil Carey