I do not know the answer to every part of your questions, but I know that if you use a USB dongle you get a new IP every time it is powercycled. If I remember correctly, my Verizon dongle changes just the last 3 digits every time I powercycle it, so you would assume that it has a range of 999 possibilities. Someone correct me on that if I'm wrong though please. In general, I feel it's a cleaner/safer route to just use a physical USB dongle and not to use any sort of wifi methods of connecting.. but that's just me being super paranoid, I'm sure tons of people have success in doing so.
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