If you are a AT&T customer and receive a multimedia message (MMS) which can't be viewed on your phone. You will instead get a text message directing you to viewmymessage.com/2 website to view the original multimedia message.
To view your message, you need enter the personal password that is given in your text message.
You will only be able to view the message within this site and reply by email to the sender. The message will expire 7 days after you receive your text alert. If you don't check the Multimedia message on www.viewmymessage.com/2 site within 7 days from receiving the message, you won't be able to view it ever again.
Lot of people often complain that www.viewmymessage.com2 using msg id does not work on viewmymessage website. The common issues is related to 7 days expiry period. If you think you received that error, you may also contact AT&T customer service for more details.