If you have got new, young programmers in your mobile development department, who were students yesterday, you have to solve a difficult problem. What you are going to turn them into? It is undoubtedly, both iOS- and Android-developers are much in demand on the resources market.
It is well known; the demand for iOS- and Android-developers has increased recently and for Symbian-developers has gone down at the same time. It is so because of the fact, the Google Android platform is the most popular one in the world; Apple iOS keeps the second place.

On the one hand it is reasonable to focus on the training of Android-specialists. The demand for them is bigger and the training usually takes less time -- 1.5 year. At the same time it takes 2 years to train an iOS-developer at an average. However, don't forget that the market's requirements are unstable and a good professional usually realizes that it is necessary to work according to the future changes in the sphere of mobile application development. The resources market in the IT-sphere responds to changes on the market of mobile platforms actively. The booming growth of Android-applications' popularity caused increasing number of Android-developers. So, a lot of analysts predict the soon market saturation with such specialists. As a result, it is expected the demand will go down and salary rates for Android-developers will become lower.