In general Euopeans don't use their cell phones as much as we do here on the left side of the pond - but your bills overall tend to be higher for what you do use - i.e. on a per minute basis the plan is more expensive, but you don't use as many minutes in general.
Also, the rest of the world operates on a 'caller pays' basis, but in North America the cell phone user is charged for all calls, incoming or outgoing - and if 2 cell phones call each other they charge each of them.
In Canada we get banged out big time - unless you have something special going on calling outside the local area IN CANADA costs extra and if you go to the USA you can be charged as much as C$4 (about 2.4 Euros) a minute, though in general is is about half that.
You CAN buy a roaming bundle to get the price down, but unless you use almost exactly te number of minutes you've bought you are SOL. Besides, the per-minute rate is a still very high.
I won't get into the details of *my* domestic plan, but what I do for the US is that I have a US phone with a prepaid 1,000 mnutes that I have to top up with at least $100 once a year (which buys me 1000 US domestic minutes) - I have about 2700 minutes credit right now.
I also have a Canadian VOIP line that costs me $10 a month and includes unlimited North American calling.
So when I travel I forward my Canadian cell phone to my VOIP line and my VOIP line to the US phone - sp incoming calls are all at the prepaid rate (.10 a minute). Calling back to Canada costs $0.30 per minute and generally consists of me telling people to call me back on my Canadian cell number and hanging up - then I pay the incoming rate for the rest of that call.
There's a web site which is the definitive site for North American cellular companies, plans and equipment. It's worth a visit:
https://www.thehowardforums.com