Not worth the hassle

Cumbersome to set up and it infiltrates many parts of your phone. You will continue to be charged every month and receive bothersome emails even after you delete the app and/or switch carriers or numbers.
And actually removing the service involves calling a specific "deactivation" number then deleting your account online and unsubscribing from email. And at every step, they ask if youre absolutely SURE you want to cancel. Once you finally complete all the steps, the multiple YouMail contacts still remain in your contact list until you remove each of them separately

KensDem13 about YouMail: Block Spam on iPhone, v4.0.33