How to turn off cell service for my iPhone?

I'm going on vacation to Europe this Thursday. And I wanted to bring my iPhone to take pictures because my iPhone has a good camera. (I don't have a camera of my own and I don't want to waste money buying one because honestly I would only use it for this trip and never again). But the thing is I also just want a break from technology, I don't want texts from twitter or people so how can I turn off the service for the 3 weeks while I'm gone? Should I put it on airplane mode? Would that be okay because I'm techinically not on an airplane? I just really want no distractions I spend to much time on my phone at home, haha!

Go to settings and swich on airplane mode

Yep, just put it on airplane mode. It doesn't matter whether you're on an airplane or not, it's just called that because it allows you to keep using your phone but turns off anything that could interfere with the plane's system (i.e. The service).