Each T-mobile number has its own email address in this format: email@example.com. For example, if your T-mobile number is then the email address associates with this number is firstname.lastname@example.org. When people send email to this email address it will be delivered to your phone in message format. The length of email is limited by SMS message length so it will be ideal for the short conversation. It is great way for people to reach out directly to your phone from their computer.