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I think that Mint's roaming rates are a bit expensive. You're better off getting a prepaid sim from a local carrier there. Since the EU has no roaming charges between their countries, you can get a prepaid sim from any carrier in the EU and it will work in all the EU countries. One of the best and easiest to get while still in the US is Orange's (France's largest mobile carrier) Europe Holiday sim. Different sellers sell them on Amazon [link] . It's full speed.
When I was traveling in Europe with it, I was forced to be on Orange while in France. That was fine since they are the largest there. In Germany and Switzerland, I actually was able to go into mobile networks settings on my phone and select any of those countries carriers. So, if one carrier wasn't great, I could just switch in the settings. I pretty much kept it to the largest carrier in those countries though, Telekom and Swisscom.
With the Orange holiday sim, it's 20GB for around $50. If you look up Mint's rates for somewhere in Eastern Europe like Poland, it's $0.20 per MB. So for 20GB that would be $4,096. Even for a more reasonable 1GB, the price with Mint would be $204.
Make sure that your phone is unlocked.
If I were you I'd get the Orange sim or some other local one there. However carry your mint sim with you. That way you can use the mint sim on wifi for free calls and txts with your own US number. Just make sure that when you do that you turn on airplane mode and only leave wifi on and optionally bluetooth on. That way your phone will not roam with the mint sim.
>There is a way to get a mobile number before arriving in France?
You can buy this SIM card online here or here with a French phone number that you can use anywhere in Europe. You can only activate once you land in Europe though.