How to set a custom mail signature on iPhone
Step 1: Tap on the Setting Application from your iPhone hme screen.
Step 2: Next, Tap on Mail, Contacts, Calendars.
Step 3: Then Scroll down to Signature.
Step 4: Enter your desire signature details as you want it to be.
Now this new custom signature will be added to all the emails you send to your contacts. you can also change it later just following these steps. Please remember this signature will be on all your outgoing mails so make sure it is appropriate for all your contents.