Using my iPhone abroad- Internet charges?

I'm going to Perth in Australia & Hong Kong next month. My iphone is with Orange in the UK and my internet is normally free. In both places our hotel has Wi-Fi so can I use my phone for free abroad in Wi-Fi spots? I don't want to get home to a massive bill.
Out of interest if I used whatsapp in non Wi-Fi spots to send a couple of messages to my friend in hong kong is this going to cost me a fortune?
And what buttons should I press on my phone to ensure the Internet is completely off when I want it to be? IPhone 4.

When you go overseas, your Internet will be on 'roaming' which costs more than normal because it's 'borrowing' from another network. I don't know the exact prices, but you can find out by just googling your provider and the plan you're on. From there, check out the details.

In order to turn it completely off, go to Settings > General > Network and turn off 3G and data roaming. That's how I do it on the iPhone 4S.

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