Viber voip, calls and texts free for iPHONE and ANDROID

I've used this for awhile, when it works it works well and the clarity is good. When it doesn't, it's annoying but not bad overall. Texting is generally without issues. It runs in the background so I kill it and have found that if someone contacts me, it will startup. Have fun everyone!
http://www.viber.com/

Currently for iPHONE and ANDROID PHONES
Here is the compatible Android phones list:
http://helpme.viber.com/index.php...quirements

Additional Apple info:
iPhone: Viber works with iPhone Models: 3GS and 4, with IOS: 3.1.3, 4. and newer.

iPod touch and iPad (latest generations) are partially supported.

I think "partially supported" means you could come up snake eyes if you roll.