I was reading an article earlier that spoke of T-Mobile's & Sprint's upcoming network technology improvements. I haven't kept up with any of that, so it is all news to me. I couldn't find that original article, but here are others that describe the same things. LTE-U (LTE-Unlicensed Spectrum) LAA (Licensed Assisted Access) This is the T-Mobile article here. HPUE (High-Performance User Equipment) Sprint article here.