Sadly, 2015's first-quarter earnings season for the wireless industry has come to a close. But now the real fun begins. We can now measure how the nation's top wireless carriers stacked up against each other in terms of key metrics. Jackdaw Research analyst Jan Dawson has assembled some compelling slides that provide an in-depth look at how Verizon Wireless, AT&T Mobility, Sprint and T-Mobile US performed in Q1. FierceWireless has these slides and a full report right here.