Wifi Calling

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http://androidforums.com – I have an Original Droid Incredible not rooted on Verizon and wanted to see if there were any good Wifi Calling apps out there that actually WORK. I see a few on Google Play but the reviews don't look too good. I will be traveling to Korea and wanted to be able to call home using Wifi preferably a Wifi App that works and preferably free. Thanks in advance... (General)