Cloud Storage is a model of online data storage where data is stored in the virtualized pool of servers hosted by third parties (CSPs) and located in different geographical locations. Cloud Storage revolutionized the way how users access their data online anywhere, anytime and using any device like the tablet, mobile, laptop, etc. A lot of issues as vendor lock-in, frequent service outage, data loss, and performance related issues exist in single cloud storage systems. So to evade these issues, the concept of Multi-Cloud Storage introduced. There are a lot of Multi-Cloud Storage Systems exists in the market for mobile devices. In this article, we are providing comparison of four Multi-Cloud Storage Systems for mobile devices Otixo, Unclouded, Cloud Fuze, and Clouds and evaluate their performance on the basis of CPU usage, Battery Consumption, Time consumption and Data usage parameters on three mobile phones Nexus 5, Moto G and Nexus 7 tablet and using Wi-Fi network. Finally, open research challenges and future scope are discussed.