International Card Suggestions

Hey guys,
So my friend is gonna be leaving for Korea this Tuesday and finally convinced me to tag along because I was able to find a decently priced ticket. This is my first time traveling outside my home country without my family so just need help with a couple basic things. Firstly, obviously I’m gonna need to spend money there somehow so I’ll need a card, I’ve seen a lot of ads for Wise and wanted to see if that’s a decent card and simple to use? Also what would be the best way to contact family and friends back home without getting any international fees on my cell? If you guys have any suggestions on things I should do or know before heading out please share below, thanks. I’ll be leaving Sunday solo and will be spending 2 to 3 weeks in South Korea as some background info if that’s necessary.