We're heading down to Belize for some diving. There's going to be wifi at the hotel but supposedly everything down there is roaming and at $3/min, that's not going to happen. Can I set the phone to not roam (even if there's no way to get calls) and use Skype to call my boys over the wifi? I'm not verse in Skype but I thought I'd ask about whether I can use my phone. Thanks.