Starting today and for the next 12 days, Vodafone is offering you the chance to win a new smartphone. To be in with a chance of winning a bran new smartphone you need to enter Vodafone's 12 day competition. The last day of the competition is 22^nd December.

The competition is called "12 days of smiles". You are asked to Tweet something that makes you happy as we near Xmas - such as  "I just saw Santa ! #mademesmile"

The prize for today is a HTC Wildfire and you can check out the competition details here.

You can use regular Tweets, include pictures, add links to a website that just put a smile on your face, or even tweet your check-ins on Foursquare, Gowalla etc

The competition page is updated each day to show the prize for that day and the winner will be announced at 5pm each day. A different smartphone is up for grabs each day.