XCom Global is a pocket WiFi rental based service that is a a great option if you want the best possible coverage with unlimited data consumption while traveling. You just need to subscribe the service for a flat rate of $7.77/day, arrange device pickup and return it when you're done.
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Pro Flat rate for unlimited use
XCom Global has a flat rate of $7.77/day regardless of the country you're visiting and with unlimited data.
Pro Great European coverage
Con Extremely pricey when used in multiple countries
XCom's flat rate of $7.77 only applies if the device is used in 2 countries. If you're visiting 3 or more countries, a $30 extra fee per country is added to the total cost of the service, up to a maximum of $90.
Con Hardware misses some modern features
The modem they use (Mifi 2372) is a few years old and is outdated, when compared to some of the newer WiFi models. For example, it does not have a replaceable battery or screen to display usage information.