A phone that doesn’t make calls

I’m planning to go to the US on holiday in a few weeks. I want to use my iPhone 6 as a camera while I’m away but I don’t want to risk running up roaming charges if I receive calls or texts. Is there a way of avoiding this? I can turn off cellular data, but I can’t find a setting to turn off phone calls and texts. Lyn Moore

Turning on Airplane Mode disables all wireless communication systems in your iPhone. Counter intuitively, you can then switch on Wi-Fi in isolation, keeping all other systems off. (This also works for Bluetooth, should you need to use, say, headphones.) You’ll be able to get online over Wi-Fi and the camera will work just fine.