Mobile payment is a quickly emerging practice, supported by the dramatic increase of mobile phone or device users around the world.
Experts estimate that in 2013, the total commerce done in mobile payment systems was around $600 billion, or double the estimate for 2011.
Several main types of mobile payment systems are commonly used to sell goods and services over mobile devices. Some are similar to laptop or web-based systems, where users enter credit card information into a mobile app.
Others have different models for convenience: for example, 'direct-carrier’ billing allows the user to input some types of cost for a digital purchases directly into their cell phone carrier bill.
Other types of proprietary vendor built systems might allow someone to get, for example, a cup of coffee or another kind of products through a system where their payment information is housed in that companies database.
Aside from relying on the emergence of smartphones, mobile payment also relies on the evolution of 3G and 4G wireless networks as well as personal merchant account services that help businesses to use mobile devices at it point of sale.