How to use my iphone in Singapore without extra charges?

So I live in America and am planning on visiting Singapore this summer. I have an iphone 5 and I was wondering if there was some way to just use the phone for taking pictures/using Whatsapp/Snapchat while I'm over there without being charged by my carrier. I won't be using my phone data but probably just wi-fi. But if someone calls/texts me will it still charge me for it?

Yes, of course you will be charged unless you put your phone in "airplane mode".

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