Ask HN: How to get customers signed up for a free trial?

I'm looking into the UI aspect of getting customers to sign up for a free 30 day trial and then convert them into paying customers.

Do you think it's best to use wording "a month" instead of "30 days"?

How about getting rid of "trial" and just using "Try namehere"

Examples: Try namehere for a month, free! Try namehere free for a month!

Free trial for 30 days! Free trial of namehere for 30 days! Free trial of namehere for a month!