Mention your Twitter page as many places as you can, e.g. your business card, e-mail signatures, web page, blog, Facebook, etc. Create a tweet button or at least your Twitter name on your pages
The best option according to me is to actively participate and use #tags where ever you can..follow me for more info @anurag8891
There's a lot of options that you can do to have more followers , I would suggest that you follow celebrities in all walks of life like famous athletes, news anchors, showbiz personalities,famous people, businessmen,politicians , religious personalities ,philanthropists and not limiting to tv shows ,movies , anything of some sort. And that you should also post a lot of stuff whether about yourself, how you feel , your opinion about on anything and everything.The more you tweet , the more people will notice and will also add you back.Like I follow you and you follow me.Most importantly tweet with discretion and with a sense of responsibility.Better not be talking if the intentions are only to harm ,discredit ,that leads to any defamation.Live peacefully!
Try using a social exchange site such as the one in my signature. This way you follow others and then be followed back. You can gain thousands over time using this method. Also they are all free and real followers!
Post quality and informative tweet regularly, retweet other user tweet and follow same interest people on twitter is the natural way to increase followers. If you want some other way use addmefast and other social media exchange for increase followers, facebook, google plus and youtube likes also.
people likes interesting tweets, so tweet interesting tweets on twitter, you will receive good followers.
you can also submit your twitter account on twellow directory, this also a Great way to increase your followers.
Retweet or reply to others, tweet good stuff. Participate in programs which offer gaining followers, but be careful in your selections.