Nexus 5 wifi calling

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http://forums.androidcentral.com – Hi All, I really appreciate if someone could help me out with this. I don't have one of those unlimited cell phone plans and I mostly use my phone with wifi. I have tried installing talkatone and zenitalk on my new nexus 5. None of them seem to be working , it will install and then when i try to place a call it gives me some error message and shuts off. Are there any other applications like this and/or has anyone had a similar problem and if so how did you fix it. I have not rooted my phone I have stock android kitkat that came with the Nexus 5. Appreciate any help Thanks :):) (HowTos)