I can’t Install any app on my phone

Hi despite256,

Welcome to the Apple Community.

If you can’t download or update apps on your iPhone or iPad

https://support.apple.com/en-us/HT207165

More info:

Learn if you can buy apps, movies, music, books and more,

or use Apple Podcasts or Apple News, in your country or region.

Find out what services are available in your country or region:

https://support.apple.com/en-au/HT20441

See what payment methods you can use in your country or region:

https://support.apple.com/en-au/HT202631

OR

If your payment method is declined in the App Store or iTunes Store

https://support.apple.com/en-au/HT203005

All the best :-)