I have recently bought a Samsung Galaxy S10. I am going to the USA next week. Can I use the second sim slot for an American sim or am I better using an old, unlocked phone?
Best answer by Gregor
As long as your phone is unlocked you can use Sim Card from USA. AT&T might struggle with LTE connectivity on your phone as it's using different frequency bands than the ones supported by European version of your Galaxy. You will still be able to connect to 3G so you won't be completely offline.