If you send an email via iOS, a signature will be automatically added in reply such as “Sent from my iPhone”. But you can create a custom signature that is more personalized if you wish. To do this, follow these steps:

1. Open the main screen of your Apple Mobile and click on the Settings icon.

   

2. Tap on Mail, Contacts, Calendars.

   

3. Now tap on Signature.

   

4. Customize your signature

   

After changing it, your device will send emails with your customized signature instead of the default signature.