Curious... It's simply capable of using a 3G/4G modem to establish an internet connection for your network? Why would anyone choose 3G/4G over cable, FiOS, or business-class DSL or T1 services if they're available?
I can not see many businesses wanting to run all there traffic on the cellular network. Hell looks at what so many iPhones have done to AT&T's network. Not to mention the price and bandwidth limits(cap) on cellular internet