Also there are some disadvantages
Combination of technical and education challenges are the limitation of m-learning. Some of these disadvantages may disappear as technology improves.
• A Fragmented Learning Experience
Stanford University’s Language lab developed such study. With mobile device it provides some insights into the fragmented experience of learning. The lab staff chose foreign language study as the content area. The prototypes which were developed, let users practice new words, take a quiz, access word and phrase translations, work with a live coach. Also they can save vocabulary to a notebook. It is very important to remember that "Learning requires concentration and reflection".
• Lack of Well-Developed Skills
Learners refer the ability to be aware of it. Also it is useful to monitor their learning processes. The challenge in wireless and m-learning is that learners have little experience with this delivery mode and the  related instructional strategies. The more difficult skill is self-assessment, the learner's ability to judge how well he or she has actually done learning and transferring new skill and knowledge.
• Small Screens and Difficulty Accessing Information from the Web
Mobile and wireless devices have significant disadvantages relative to screen size. Also their ability to access information designed for traditional PC-based Web viewing. Nowadays, we may be sure as to the websites that they are basically scaled-down. And they redesigned to eliminate graphics and multi-column layouts. The worst is that websites don't offer mobile version. In this way you get crunched images. Also the disadvantage is that skinny columns are almost impossible to read. It's understandable that traditional websites are intended for a big-screen user experience. Putting them on a small screen is like the dog that sings: the miracle is that it does so at all.
• High Payment
One of the biggest disadvantages of using a mobile wireless e-learning solution is the price. It takes a compelling business case to implement this kind of technology for learning.
• Challenges to the Security of the Device and Its Data
Security is a challenge in the office environment with desktop PCs. That challenge is magnified with mobile devices. In case of their size and portability, they are easy to lose. There are also serious considerations regarding data security. In a Computer World there are estimates that probably fewer than 10 percent of mobile devices used by major organizations. They have serious protection for stored data.
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