Using Currensea in Brazil atm. Works really well. Only sometimes I need to insert my code if it's a higher than average bill. The exchange rate varies and isn't great at times.

I've also downloaded to Google wallet but have yet to trial it but must do so soon.
The ability to freeze quickly via phone app is so welcome. My card dropped out of my phone case and not knowing where it was I froze immediately. Card found later and reactivated but if in danger of losing the phone and/or card whilst travelling may opt to keep on freeze until I need to use it. You can also cap daily spend which is good in case it gets into the wrong hands.