To use Callblock on your iPhone, you of course have to install the app, which is free to download from the App Store .

Callblock is free to try for one month. After the one-month free trial period, Callblock will shift to subscription.

After installing Callblock, open the app and when prompted, choose your preferred subscription type and confirm your subscription using your Apple account.

Callblock is free to try for one month. After the one-month free trial period, Callblock will shift to subscription and will automatically renew using your Apple account for $1.99 monthly or $19.99 annually, depending on which subscription plan you choose. You can cancel your subscription anytime by going to your Apple account setting on iOS or iTunes.