How can I get apps on my iPhone XS

Why can’t you just download and install apps from the App Store? Large installs will require you to be on a WiFi network as they won’t work over cellular.

Download apps and games using the App Store - Apple Support

What happens when you try? Error message(s)?

Do you have access to another WiFi network where you can try? That has worked for several people.

Try a restart.

Restart your iPhone, iPad, or iPod touch

Try a forced restart.

Reset Device

If necessary

Hard reset

Do a backup and try a factory reset. Then restore from your backup.

Restore to Factory setting

Backup - Restore your device from an iCloud or iTunes backup