I really don’t like the default ‘Sent from my iPhone’ signature. I find it non-personal and elitist. Here is how to change it. This is current as to of iPhone iOS 9.
- Tap the Settings icon
- Scroll to Mail, Contacts, Calendar and tap it
- Scroll down to Signature and tap it
- Delete ‘Sent from my iPhone’ and enter in the text you want as your email signature or leave it blank for no signature
If you have more than one email account on your phone you can set a different signature on each account if you like. That is just a simple setting on the same page where you entered your new signature.