We send content to Cricket phones as attachments in picture messages.
you received a text message with a link in it; that means that we don’t know who your carrier is. It’s easy to fix. Just go to the Account -> Phone Details page and select your carrier and phone model, then resend the content to your phone.
When you receive the message, open it and save the attached file to your phone. Then set the song as your ringtone or the picture as your wallpaper and Enjoy!