If you send an email via iOS, a signature will be automatically added in your reply, such as Sent from my iPhone. But do you know that you can customize this signature as well?
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Open the main screen of your Apple Mobile and click on the Settings icon.

Steps to change the Signature of an Apple/iOS (Sent From My iPhone)
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Scroll down and tap on Mail.

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Now tap on Signature.

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Customize your signature.

After changing it, your iOS will send your customized signature instead of the default signature.