Turn iPhone to iPod in another country?

I'm going on a month long trip to Japan and would like to bring along my iPhone 4 to take pictures with, listen to music, etc. I'm NOT TRYING TO USE IT AS A PHONE TO TALK OR TEXT OR USE DATA. I don't have international services. So I figure I can take out the SIM card and it will be an iPod touch with no services, right? My problem is that I don't want to come home to a big fat surprise bill.

Doesn't iPhone have Wi-Fi mode? That way you can take out the sim card, get no cellular, but still use the Internet to Skype, email, even text & call with the Pinger/TextFree app, & back up your photos.

Just take off the SIM card before you are going to travel, so no surprises in the phone bill. For added safety, turn on airplane mode and leave it on while in Japan. That's it and enjoy your trip. And yes, your iPhone will be basically an iPod touch, just better camera.

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