I recommend Republic Wireless. $25/month gets you unlimited 3G (5 Gigs, then throttled to 2G) data, voice and texting on the Sprint Network. You have to purchase the phone outright (Moto X) and they hope but don't absolutely require that you offload to WiFi. The WiFi turns out to be a great feature because you can make calls and send texts seamlessly--great if you work in a basement or live in a bad cell area like I do. I wrote a blog posting about my experience here: http://www.eroncohen.com/2013/...

Unless they're talking about service in an uninhabited, isolated place, the obvious answer is wiFi. At my house there is no decent cell service from any of the major carriers. This is one of the reasons we have been using Republic Wireless' "hybrid" service--it uses wiFi for data and texting when you're near a known hotspot and mobile service from Sprint (or its roaming partners) when you're not, and it includes unlimited data--all for $19/month ( review here: http:///www.longmeadcrossing.com/republicWireless.htm ). Verizon can pretend that this sort of thing doesn't already exist but meanwhile their market share will fall and they'll deserve it. I think a windowless room is the perfect metaphor for their position.