Just when I thought that AT&T's (NYSE: T) proposed $39-billion purchase of T-Mobile USA didn't have a significant impact on the enterprise, T-Mobile USA decides to significantly bolster its enterprise offering.

On top of that, the U.S. Department of Justice today filed suit in federal court to stop the purchase from going through. It argues the deal will hurt competition.

Last week T-Mobile--known for its low-cost service offerings--introduced a new solutions suite for enterprise and government users that runs the gamut of services: enterprise messaging, telecom expense offering, secure mobile data access and mobile device management (MDM).

T-Mobile has decided to partner with best-in-class companies that will do the heavy lifting for the services. The operator is using Good Technology's Good for Enterprise for MDM and security, Syniverse's enterprise messaging service, telecom expense management solutions from Ezwim and secure mobile data access from Wyless.

While not well-known for its enterprise offerings, T-Mobile has gotten aggressive with two unique offerings: low international-calling pricing, thanks to its parent Deutche Telekom, and voice over Wi-Fi services.

T-Mobile still lacks some key components such as professional and managed services, but research firm Current Analysis notes that T-Mobile has been gaining traction in the consumer/prosumer and SMB markets for some time.

The operator has already seen a 26 percent year-over-year increase in enterprise activations, which shows it can be successful in the enterprise segment and that there are untapped opportunities, Current Analysis analyst Kathryn Weldon wrote in a research note.

Questions remain

Of course the big unknown is AT&T's proposed acquisition of T-Mobile, which has been made more cloudy today by the Justice Department's action. Will the enterprise shy away from these offerings given the uncertainty of the deal and the fear that AT&T will later increase pricing? Or will they want to reap the short-term cost benefits?

As Weldon wrote: "Some large enterprises will worry that they will have to swap out their devices, service plans and mobile applications for TEM, MDM, security etc. if AT&T is the new owner. Others may rush in now to get good deals from T-Mobile before it's too late in order to have service plans grandfathered in for the next two years. Assuming they can still be customers for one to two years, they may very well look for solutions to their cost and device management issues from their carrier." - Lynnette