There are lots of unique aspects to mobile devices from a marketing point of view. One of the main ones being that you can target a customer anywhere at any time, this is also helpful as you can contact the customer almost instantly using SMS.
More unique aspects of mobile devices are that they have now become a very personal belonging holding a multitude of information for the user, from simple information like shopping lists, alarms and general notes/reminders to sensitive information such as bank/card details, social media logins and contact information. Although mobile devices hold all this personal information, users are not deterred from entering the information. A lot of users consider it a convenience for them to input this information into their phone as they can pay for items easier using 1 click payments and also have access to their social media accounts whilst on the move.