The Personal License allows you to access your institution on any of your devices as long as they are on the same platform (i.e. either iOS or Android).
That is, if you have an iPhone, iPod, and iPad, you will only need to make one Personal License purchase in order to access Mobile Learn on all of those devices. Similarly, if you have an Android phone and Android tablet, only one license is necessary to gain access on your Android devices.
However, since Google Play and the Apple Appstore are different systems and do not allow us to transfer user licenses from one store to the other, you must purchase a different Personal License for each platform. If you have an Android phone and an iPad, you will need to purchase separate iOS and Android Mobile Learn Personal Licenses in order to access your institution on both device platforms.
If you are wondering how to restore your purchase on another device, please see this article.