A built in iOS feature that many do not use is the Keyboard Text Replacement. This feature allows you to create a keyboard shortcut to type in text, including frequent replies to email and messages.
The idea is simple. Let’s say you find your self always typing out text like your email address, phone number or mailing address. Instead of typing all that information repeatedly, you can create a keyboard text replacement.
For example, “eml” can be made to type out your email address or “htn” can be made into “I am heading there now. I should be there in a few minutes.”
To create your Keyboard Text Replacements, go to Settings > General > Keyboard > Text Replacement > +.
After typing the + you can enter your Phrase and Shortcut.
Type the phrase you want to have the shortcut type out and type in the shortcut phrase that will create it when you type it in the future. Then press save. Try not to use the beginning of real words as that can cause problems.
Now, when you are in any app that uses text, you can type the shortcut and it will be converted to the full text. Create several shortcuts and begin using them.