Israeli startup MyState shows the availability of a contact before dialing by displaying if the person is on a call, offline, on vibrate or silent, has no Internet connection, is in a different time-zone, or their battery is running low, or charging. MyState has just raised $6.5 million of funds.
http://www.globes.co.il/en/article-israeli-smart-communications-co-mystate-raises-65m-1001096895