We spent a couple of weeks in Europe, and once we figured out how and where to buy the right SIM card, it worked beautifully

it is not 3g or 4g I have bought sim card from ATT and it does not support so my money was wasted

It came charged, so we just popped the SIM card in, and it worked

We bought 1 unlimited wifi SIM card and installed it in this and connected both our phones to it.

I initially purchased a phone w/unlimited data sim card

The same SIM card that was on the device is now in my phone and it works perfectly fine.

Bought a SIM card at the airport, and the person working at the store said she was surprised how easy it was to set up

The iOS app made it very easy to track usage and battery level, as well as, provide any messages the SIM provider had regarding your service.