A company that produces a device that fakes GPS (with extremely weak RF so as not to draw the ire of FCC or other government bodies) to convince the phone it is in Europe.
Cell towers and wifi base stations announce country code too. There's no guarantee they're using GPS.
Yeah, if I was a betting man I would bet that they're using location from cell tower pings. Good luck with that.
This would be illegal, even at a low power.
Faraday cage, where you will close the phone inside - Inside it will have WiFi VPNed to EU country and emulated GPS
It's cheaper than that, if you're in the US. There's plenty of EU countries' land on the west side of the Atlantic. All over the world, in fact.