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 Great European coverage
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.
Con Costs about the same as other options if you don't live in US
The cost of shipping this to countries outside of the US and also returning it on your own dime, in the end costs about the same as other devices.
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 Bad battery life
The battery lasts for only about 1.5 hours of light usage out of the device before it dies.
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The modem they use (Mifi 2372) is a few years old and is outdated, when compared to some of the newer WiFi models.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.