One is to combine any VPN with a fake GPS app, and these are easily found in the Play Store. On Android you’ve got a few more options. Unfortunately, location spoofing is almost impossible to do on iOS, and while there are some programs you can use to fake GPS locations while your iPhone is plugged in to your PC, there’s not a good option for location spoofing on the go without jailbreaking your device. That means that while websites will show you different content because your traffic is coming from a different server, mobile apps with location tracking enabled will still be able to tell exactly where you are.
Although the best VPN can get you access to overseas content, there are very few true fake GPS VPN services on the market.