I communicate by email with several people who have begun to use smart phones. I noticed a big change in email after they got the smart phone. Their email became less reliable. They say they sent email that I didn't receive. They say they didn't get emails that I sent. I wonder if there's a technological explanation for this or whether its just psychology - increased forgetfulness or making mistakes using the smart phone interface. (Perhaps they more often use the website interfaces at places like gmail rather than using email programs like Outlook local to their machine.) After they get the smart phone, they seem to overlook or forget things things I've written in emails they are replying to. I wonder if this is because it's harder to read the quotation of my email that's embedded in theirs. Or perhaps they are less iikely to include the quotation. I don't have a smart phone yet. Maybe I have to get one to appreciate the difficulties.