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Delete the existing signature by tapping “Clear”, and replace it by typing in the new desired signature, exit out of settings to save the change.Again, go back to “Settings”, then go to “Mail, Contacts, Calendars” and choose “Signature”.If you just want to change the iPhone email signature from the ‘Sent’ message, the instructions are very similar to that mentioned above: This can be reenabled at any time just by reentering into those same settings, but you can also customize the Mail signature to something else if that’s what you’d rather do.
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Any time a new mail message has been composed, sent, or replied to, the iPhone will no longer attach the “Sent from my iPhone” message with any emails. Tap “Clear”, or just select all the text and delete it manually.Scroll down a ways and then tap on “Signature”.This is actually the same on an iPhone, iPad, or iPod touch, though we’ll focus on the iPhone for obvious reasons: How to Remove the “Sent from My iPhone” Signature
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