Google Voice has been a great way to make and receive free calls to USA and Canada. We have also shared a trick which enables users to make free calls to 60+ countries using their Google Voice account. Now, Google has announced the ability to make voice calls to regular landlines and mobiles from Gmail via Google+ Hangout, and to sweeten the deal calls to the US and Canada are now free from all countries where Hangouts calling is available. So this means if you have any relative or friend in USA or Canada you can call them for free from anywhere in the world.
This is not all, the new “Hangouts calling” also supports conference calling to multiple phone numbers and video participants on the same call, as well as play sound effects with the Google Effect app like applause or laughter.
Designed with the motive of being the easiest way to enjoy online video and music on your TV, Google Chromecast costs just $35 and is almost plug-n-play. To get started a user just need to plug Chromecast into an HDMI port, connect it to WiFi (provide password of your WiFi network), and start sending videos and other content from smartphone, tablet or laptop to your TV with the press of a button. Chromecast works with devices you already own, including Android tablets and smartphones, iPhones®, iPads®, Chrome for Mac® and Chrome for Windows®. Browse for what to watch, control playback, and adjust volume using your device. You won't have to learn anything new. Do watch the introduction video posted below to know more.
There are numerous hacks, tricks and exploits to bypass various kinds of limits imposed on mobile data usage by cellphone carriers. No matter how much carriers try to block them, users always find 
