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I have an own mumble voice chat server (pc). Mumble can be used on smartphones as well and support's voice chat too, Whatsapp I used before but don't like it as much. I do have Skype and I use it as my primary IM program (used WLM before until it was closed down and replaced by Skype), the thing with Skype is ... it's personal, I don't really share it wildly around "guilds, clans, ..." I will share it with people but that is after I know them and as a "friend", not that I mean guild or clan mates aren't friends but you know what I mean ...