A. To avoid being charged immediately, carefully review the app's subscription details before making any purchases. If you have already been charged, you can go to your iPhone's Settings, tap on your name at the top, select 'Subscriptions', and manage or cancel your subscription from there. This will prevent future charges.

B. Consider using the App Store's 'Ask to Buy' feature if you are concerned about unexpected charges. This feature allows you to approve purchases before they are made, giving you more control over your spending.