The first time I used this tactic, I saw a 150% increase in conversion rate on the mobile site I was working with.
You can increase your mobile conversion rate by using a floating call to action button in the bottom of a mobile browser. Putting the call to action close-at-hand and prominently in the mobile design makes it easier for visitors to take action. Instead of hunting around the page, your call to action is always front and center and always top of mind.
You can place a round button in the lower right hand corner or place a bar across the bottom of the screen. Just make sure it doesn’t block any content at the very bottom for your page!