Today everyone has a phone or above, and there are Wi-Fi cover all the shopping malls and streets. Everyone can know what happen of the world anytime, anywhere. 
In Hong Kong, people will be internet search what they needs, for example Facebook, Instagram or Taobao. Because this websites are convenient to search. So Mobile Phone Marketing is catching people this mentality, to make people know that we can help you to buy or search everything what you want. People's mentality are where is convenient and the reasonable price, they choose the better one.
Also, mobile phone is the important thing in our life. You have a call for your family or friends or your business partners. Maybe you said I used the Email to contract my business partners. Mobile phones can check the Email anytime. Every minute are important for your business. If you didn't have the mobile phone, you would lost the contact in the world.
Facebook's founder Mark Elliot Zuckerberg, is the examples of success. He created Facebook, everyone can make a new friends or they can find their old friends on Facebook. Facebook make our relationship more closely. And there are some little games for users, like candy crush. Game developers can use the Facebook to sale their games. Fortunately Game developers will be famous on the world and earn money. Facebook's user can play on the mobile phone if they bored.
Last one example is YouTube. Everyone can upload any videos to YouTube, and to be a YouTuber. Also advertisers will choose this website to sell their products. Everyday YouTube have a thousand or above new videos have been uploaded, people can search any videos on YouTube. 
Mobile phone is the important thing in our life, we need it to contact or surfing the internet every moment. If you can catch the people's what they need, I think your products will sale successfully.