Yes Blars, I think you may be right. The unlimited plan may use Sprint, or at least Sprint is one choice and possibly the default choice. But when I ordered mine, I did chat with the guy about RV'ing and specifically wanted Verizon because of more towers and he agreed and he didn't indicate that would limit me to the MiFi. I would think that the stick vs. the MiFi shouldn't matter to Verizon. All they care about is the gig's that Millenicom uses. I have heard the Bring Your Own Device is limited to Sprint. As to overages, the unlimited plan says: <span style="color: #636363; font-family: 'Open Sans', 'Helvetica Neue', Helvetica, sans-serif; font-size: 12px; line-height: 20px; background-color: #f9f9f9;">The unlimited service is for personal and family use and is not to be used for commercial purposes or as a public WiFi or broadcast to multi-dwelling units or any other extraordinary circumstance. Usage over 50 gigabytes in one month will alert our investigative team.<br><br></span>I really don't like Millenicom's reporting either. Even the weekly sucks. I know that you can sign on to My Verizon and monitor usage, but I am hesitant to do so much since they "ask" that you not do so and they do seem to have a willingness to chop people off quickly. The FAQ says: "<span style="color: #636363; font-family: 'Open Sans', 'Helvetica Neue', Helvetica, sans-serif; font-size: 14px; line-height: 20px; background-color: #f9f9f9;">Millenicom does not have an agreement with our upstream carrier to utilize any of their resources other than their national footprint. Please do not attempt to utilize any usage information other than the two methods [email and support ticket] listed above." </span>I do get the sense they are a little sloppy with the limits, but if you blow by the 20 Gig by 10 Gig, you will probably get popped. Likewise, if you do 70 Gig on the unlimited, you also may well just get shut down. I am not close to the 20 gig, so it is not a big deal for me.