How to call your LinkedIn contacts from your iPad

Hookflash

If you're a regular LinkedIn user and keep in touch with your contacts regularly, Hookflash makes this a breeze. Hookflash will allow you to make video calls, voice calls and messaging with any of your LinkedIn contacts around the world by using just your Wifi connection. If you have the iPad with Wifi and 3G/4G, then you can use your 3G or 4G network to call.