Will airplane mode on iPhone promise no overseas data charges?

I'm travelling overseas tomorrow. Is all i need to do is put on airplane mode and I'm safe from any charges?

also, if my phone dies while on airplane mode and i charge it back on will it still be on airplane mode?

If it's on airplane mode it's essentially an iPod - it doesn't connect to any data source (3G, Wi-Fi etc), so can't cost you anything.

It should stay on airplane mode even if the battery dies

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