Briefly looked into secure communications a few days ago. If you want to speak somewhat securely and simply, use Skype. But not the smartphone version. There are superior methods I'm sure, but it'd probably require more time and investment to figure out. If anyone here is knowledgeable about such things, do share.
Source: http://www.quora.com/What-is-the-most-pr...ere-is-any
Source: http://www.quora.com/What-is-the-most-pr...ere-is-any