In this article, we'll explain how to change the language on an iPhone, including the language of Siri and the keyboard.
How to Change the Language on Your iPhone
Although you initially set the language during the iPhone setup process, you don’t need to reset your iPhone to change the language. Once you choose a new language, your iOS device will load the new language settings and you’ll be using the new language within seconds.
First, open the Settings app on your iPhone.
Scroll down and select General from the menu.