One of the most important factors in the success of a mobile app is the number of users or the number of downloads that mobile app has. For example, Facebook is considered to be one of the most successful mobile apps of all time and that is because it is being used by billions of people across the planet. An easier way to ensure that your mobile app will have a high user base is if you create an iPhone and android app. If your mobile app is compatible with both iOS and android operating systems then the chances of your mobile app to have more users will increase. What other ways can you increase your user base?