Once you have built your audience and have your message, then it is time to decide between an SMS or MMS message. Here are the pros and cons of each:
Most affordable messaging option
Send to a Target List
Attach Mobile Coupons
Attach Mobile Webpages
160 character limit
500 character limit
Alternative message for non-MMS supported contacts
Attach a .jpg Image File
Attach a .mp3 Audio File
Attach a .3gp Video File
Attach a .gif Animated Image File
More expensive