I have one of the original Skyroams and have had great luck with it. The only country (so far) that it didn’t give me WiFi was in Montenegro. That was two years ago, and they may have added that service since. I just returned from Austrailia and New Zealand and it worked great in both countries. One of the nice things is if you are walking or driving, you can use your cell phone or iPad for google maps, Resturant recommendations etc.
I start it, throw it in my pocket or backpack and it is available as needed. Mine allows up to four devices to connect at the same time.
I have several friends that also have them. If we travel together one starts his up and we all piggyback off it for the day.
They have a new one out called Solaris ( I think that’s the name) and it also has a battery backup included to recharge your phone or tablet. I don’t have any first hand knowledge about those except I keep getting pop up adds on my iPad for them.
My 24 hour day charges are $8... if others share, it’s pretty cheap. I also used it on a cruise ship. When we were close enough to land to have a cell signal, I could put it on the balcony for the best reception and then it would supply my phone, iPad and my wife’s WiFi.
I have had trouble trying to get SIM cards to work so I went that route. Get off the plane in Paris and turn it on to get an Uber from the airport and the savings from a cab will pay for a weeks free WiFi.