I bought this unit before I traveled to Europe, I wanted to test it before the trip so I used a Mintmobile SIM card and it didn't is working. I contacted Revain who called tech support and they told me it was a Mintmobile issue. I took a chance and hoped it would work in Europe with Orange Sim and it worked, it worked great with Orange Sim in Iceland, France and Italy. We had 4 phones connected at all times and were using Wi-Fi to call our phones through this unit. The battery never went dead because every time we get in the car we plug it in, but I think it has a decent battery. When we got back to the US I was dying to use it with Minmobile so I checked the Mintmobile website and it says set up Android devices to use cellular data and it worked. It works much better than my phone's hotspot. That's why I deducted a star, sometimes I lose the internet connection and the device is dead, nothing happens when I press the power button. The only way to get it working again is to remove and reinsert the battery for a few minutes, after which the device will start working again (note this never happened with Orange Sim, it only happened with Mintmobile Sim) . . For $55 it's a very good deal, first of all it worked as 4G most of the time in all these countries, it only used 3G when I was in the middle of nowhere in France so I really appreciated having internet there.
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