How to use iPhone internationally without getting charged extra?

For instance, if I have access to Wi-Fi, can I use my apps and iMessage without being charged extra?
I know you have to turn data roaming off so you don't get charged.
If you receive a text or call, will it be charged? Or only if you open the text?
I'm traveling abroad and I just want to know how I can use my iPhone 5 internally without being charged!

If you have Wi-Fi, then you won't be charged extra. The only way you can get charged for a roaming fee is if you use your phone with another carrier while you're still on your original carrier. So if you receive a call or text, then yes, you will be charged extra. The way to avoid being charged? ALWAYS USE Wi-Fi and stick to Wi-Fi calling/texting apps and you should be fine. Hope this helped.

For instance, if I have access to Wi-Fi, can I use my apps and iMessage without being charged extra?
--yes, that's fine.

If you receive a text or call, will it be charged? Or only if you open the text?
--yes you will be charged, you'd be charged before opening it.

Put the phone in Airplane Mode, turn back on your Wi-Fi & leave it there until you return to your country.

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