Whatever happens to the US operators in the current whirl of M&A, there are two wild cards in the mobile space – two possible new entrants, Dish and Ligado. Both are holders of spectrum previously assigned to mobile satellite; both have the potential to introduce a disruptive new element into the market, especially in the nascent Internet of Things (IoT) – if they choose to act boldly. Dish is building an NB-IoT network in its 700 MHz spectrum, though while it has touted this as ‘5G’, in reality it is an affordable way to meet FCC build-out mandates. This leaves the market no wiser about whether Dish really intends to build a full mobile network, to support its own multiplay…