That's not just an advertisement. I always make sure to have an email signature on my phone that lets people know I'm on a phone. Specifically it says "Sent fr

That's not just an advertisement. I always make sure to have an email signature on my phone that lets people know I'm on a phone. Specifically it says "Sent from my phone, excuse any brevity or typos." Sending a response from your phone should carry different expectations, so I consider "Sent from my iPhone" to be entirely forgivable.