I have an iPad 2 wifi only. My job does not have wifi (really old hospital) and my AT&T iPhone 4 gets no service in my office. I figured that if my phone couldn't get a 3G signal then neither could a iPad 3G. However, I'd like to be able to use my iPad in non-wifi environments. So a few questions: 1) Was my assumption that no signal on my 3G cell phone means no signal on a 3G ipad correct? 2) Would a mifi mobile hotspot solve the problem? 3) Would tethering to my iPhone 4 solve the problem? 4) Some of the mobile hotspots have 3G or 4G in the specs. Does this mean that they can operate on 3G and wifi? or that they somehow convert the 3G signal into wifi?