12voip - Free Calls To USA, Singapore, Hong Kong Mobiles While Searching the Internet, I found that 12Voip is another program that lets you make calls via Internet absolutely free to any landline in the World (most countries) including Venezuela. Its more or less like JustVoip. Its another service from betamax providers. The only requirements are: Minimum System Requirements: * PC running Windows 7, Vista, XP, 2000 (with SP2) * 300 MHz processor * 128 MB RAM * 10 MB free disk space on your hard drive * Sound ...