Why keep a phone which is not used? Sell your mobile at the Biggest Mobile Market.
Slideshows ›› Top 50 Apps for Your Windows Phone
3) Facebook:
Another “must” for a person who is interested in social networking. Facebook is the most used social network these days. As the Windows Phone smartphones have Live Tile system, there will be a Facebook tile, where all the status updates can be seen. So, never worry that you will miss a notification. The Live Tile will make sure that you don't miss any important updates.