The waiting game for Sprint and T-Mobile

T-Mobile's Legere (on left) and Sprint's Claure taking questions via Twitter on Sunday. Photo: T-Mobile

One of the biggest challenges for Sprint and T-Mobile over the next few months will be building for two different futures.

The two companies are hoping to merge in a year's time and build their 5G network together. But each company must also plan for life should the deal fall through. Executives from both companies acknowledged that there will necessarily be some duplication of effort, but downplayed the impact.