Making a trip to Cancun soon and wondering how I can text and make calls without or little charge? The resort we are staying at has wifi. My thought was to turn off the mobile network and use Fring, Skype, GV but not sure which or if any of these will work. The Verizon girl told me Skype does not work calling back into the US. Really confused here with all the different apps available. Anyone been out of the US and successfully got anything to work?