Usually, Google Android OS based smartphones in India have 2 GB to 16 GB/32 GB on-board storage.
After installing about 20-30 apps, the phone usually start to slow down. To fix this, the best option is to move the installed applications to the SD card storage.
A simple Android application — App 2 SD Free lets the user move applications installed on the phone memory to mobile storage, i.e. the SD card or external storage.
For this guide, we used a Nexus S running Android 4.0 ICS and the app we’ve used works on Android 2.2 or higher.