Advice on best way to quickly send clients screenshots...

Hi there,

I'm a graphic designer who is constantly taking screen-shots of working art to sent to clients. I know there must be a better way than what I'm doing now:

I take a screenshot, put it in an email, send it to myself, open it on my iphone, save the image and then go into messages and text it to my clients.

A lot of my clients are on the go and sending art to check via MMS is often the quickest way - they check the art on their iphones and text me back with changes.

My question is: SURELY THERE MUST BE A MORE EFFICIENT WAY FOR ME TO GET THE SCREENSHOT FROM MY COMPUTER TO MY CLIENT'S iPhone??

Anyone out there more tech-savvy than me I would SOOO appreciate some advice - I know there must be a way with a lot less steps in between?