How to Change the Keyboard to Uppercase Letter Keys in iOS9
Changing the keyboard back to uppercase letters is the same on all iPhone, iPad, and iPod touch models running iOS 9.0 or later, here’s how to disable the lowercase keyboard in iOS:
1. Open the Settings app and go to “General”.
2. Choose “Accessibility” and go to “Keyboard”.
3. Toggle the switch for “Show Lowercase Keys” to the OFF position.
4. Exit out of Settings to immediately see the effect anywhere the keyboard can be summoned.
If you want to test this, go to the Notes app and you’ll instantly see the difference, as the keyboard is now uppercase letters again, just like it was in all prior releases of iOS.