Disable calling and texting but not WiFi or NFC

I'm going overseas soon and bringing my "usual" personal phone, a Samsung Galaxy S5, with me. I mostly just want to use it for Internet access. But one of the reasons I'm bringing my own phone instead of buying a temporary one is just in case there's an emergency I want to be able to call and text with my regular number. I don't want to get most calls and texts on vacation though! Is there a way I can turn off calling and texting from my phone but leave WiFi and NFC working? Just turning off receiving would be best but turning off sending would be fine too.