The ideal situation would be for me to add new contacts as I visit/see customers, rather than doing so on my desktop when returning to the office. I can do this in a minute on my phone in between things I'm doing throughout the day. Actually, I'm surprised this very basic functionality doesn't exist. I'd want to make sure that I can add 'tags' to it too, as this is how I upload new contacts to my Mailchimp email prospective list.