You can create custom typing shortcuts to quickly add common phrases to messages, such as “On my way!” or “See you later!”

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Open the Settings app, select General, then Keyboard. Here you’ll find the Text Replacement section. Tap the ‘+’ button and then enter the phrase and shortcut you want.

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When typing within apps, you can input the shortcut and the iPhone will offer to auto-complete the full phrase. Tap the space bar to complete the phrase and carry on typing.