When a user decides to subscribe to the mobile content, they have several methods at the disposal. One of those is to subscribe via their carrier. The user can be provided with several PIN SUBMIT offers, such as 1 Click, 2 Click, or MO Flow. All of these methods follow a different registration process. The experience has shown that the MO Flow has a very low conversion rate. Still, its commonly used due to the fact that its very safe. How MO Flow works is that when a user asks to subscribe, they will receive an SMS on their mobile phone. In order to confirm the subscription, the user will have to reply to that message with another SMS.