Apple asks for your payment information when you create a new Apple ID or try to download an app that is not available in your country or region. However, you can remove your payment information from your phone by following these steps:
1. Open the 'Settings' app on your iPhone.
2. Tap on your Apple ID at the top of the screen.
3. Tap on 'Payment & Shipping'.
4. Tap on your payment method, and then tap 'Remove Payment Method'.
5. Confirm that you want to remove your payment method.
Once you have removed your payment information, you should be able to download free apps without being asked for your payment information.
I hope this helps!