For sending an email with an attachment to a cell number with Verizon, the
email address is the 10-digit
mobile number followed by “vzwpix.com.” For instance, it will be formatted as "
1234567890@vzwpix.com." Click “Attach” and select the photo you want to
send. I am sure other carriers have something similar. FYI/SA, messages without an attachment can be sent using
1234567890@vtext.com but note it's character limited like Twitter. I use this to send notes to my wife from my work email all the time
-MIG