Our family lives in a rural, mountainous area where cellular reception is spotty at best. It's one of those places where there may be a tower nearby, but the tower is held by a carrier that doesn't use your cellular circuitry so therefore the tower doesn't necessarily help your cell's reception...
Looks like Huawei and Lenovo sales are way up. Samsung shows good YoY growth while Apple iphones sales are stagnant. That is in line with their earnings call a couple days ago.
http://www.neowin.net/news/idc-huawei-and-lenovo-were-biggest-winners-in-2015-smartphone-shipments