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The internet is a lifeline for 'dwellers but it not always available in the ways it is for sedentary folk. There are two major challenges:
Mobile (or “cell” data) is the internet access provided by mobile telecomm networks:
Perhaps counterintuitively, having a non-Verizon carrier can actually be desirable at RV meetups, since everyone else is likely to be hammering the Verizon towers.
Often you can buy data at cheaper rates. Mobile Virtual Network Operators (MVNO) are resellers who buy excess capacity from major networks and sell it to customers at reduced prices. Examples: Boost (Sprint network), U.S. Mobile (Verizon network) and many others.
The tradeoff is that your data may be deprioritized when a particular tower gets congested. Your data will still work, it'll just be slower when all those folks paying full retail start streaming Netflix at 7pm or whatever. Can't put up with that? Pay full price and take your chances with congestion anyhow.
If you want to find an MVNO for your preferred network, search for “verizon mvno”, “T-mobile mvno”, etc.