(NYSE: TMUS) Tmobile added 2.1 million new customers during the 2nd quarter of 2015. It is the current leader in domestic wireless in both stock gains and revenue from services. In comparison to Verizon and Spring, Tmobile is doing big things. Sprint is pretty much finished if it weren't funded by the US Gov't. ATT is concerned also because how the heck did TMobile add so many new customers in 1 quarter? Impressive. ATT is not even mad. Tmobile has a secret sauce for sure. John Zhang "I suppose the optimistic scenario is that profitability could improve at a moderate pace, but it's hard to see a massive upside surprise when their CAPEX and other expenses remain high as they continue to build-out their network. The margins at which they're acquiring subscribers is also extremely low, although profitability would increase exponentially if subscribers stay with them longer, allowing them to recoup the initial acquisition cost.In short, don't see the potential for an upside surprise here. What do you think?"