It's mostly because of lack of local break out https://www.dialogic.com/glossary/local-breakout-lbo https://www.dialogic.com/glossary/local-breakout-lbo Basical

It's mostly because of lack of local break out https://www.dialogic.com/glossary/local-breakout-lbo https://www.dialogic.com/glossary/local-breakout-lbo Basically your traffic travelling back and forth between roaming network and home network. Next time check your IP and you will see EU IP instead of US. Although some operators offers local breakout, it's still rare.