T-Mobile Details "Un-Relenting" Network Improvements | Androidheadlines.com. TMobile is serious about poaching customers from Big Red and Sprint. It is turning the cell industry on its ear in an "unrelenting" dash towards phone speed records. this article charts the speed advantages of the network, and its promises to build out to 5G faster than any other carrier. Verizon is in my rear view mirror, and TMobile is the new kid on the block. Zoom Zoom.