In the wake of the Justice Department’s filing to stop the blockbuster AT&T acquisition, there’s been a lot of talk that T-Mobile faces a “big 4G gap” if the deal doesn’t ultimately go through. But I think that position sells T-Mobile HSPA+ network a bit short. A Root Metrics study earlier this year found T-Mo’s network second only to Verizon’s LTE network in terms of mobile data — yes, it outperformed even Sprint’s WiMAX offering. And if the deal fails, T-Mo will have $3 billion in cash plus more spectrum to continue to tweak its network, or even to start work on LTE. Yes, things will change when AT&T officially launches its LTE, but T-Mo is far from doomed should the deal fail.