Locksmith Widget - By Sendit is a free iPhone application developed by Iconic Hearts Holdings Inc. that allows you to leave notes on your friends' lock screen. It is a social networking app that falls under the category of Social & Communication. With this app, you can easily put little notes on your best friend's lock screen with just a few simple steps.

To start using the app, you need to add the lock screen widget, link with your best friends, and write a message to put on their lock screen. The app is incredibly easy to use and has a user-friendly interface. With this app, you can leave messages for your friends without any hassle.

Overall, Locksmith Widget - By Sendit is a convenient way to leave messages on your friends' lock screen. It is a great app for people who want to stay connected with their friends and family. This free app is definitely worth trying out if you want to keep in touch with your loved ones.