This method is not only serves to BBM app for Android, but also a variety of other applications. Especially if you use the Android smartphone has a RAM capacity is limited.
How to? To clear the cache and data in the application, is quite easy. You only need to go to Settings, select Applications, and then select Application Manager, and select BBM.
Next, you will enter information into the application of BBM. In the storage section, choose clear data or clear the cache to delete data that is unused.
In addition to automatically sign out, so made it into BBID, you also lose the chat history and recent updates. That does not matter, because the BlackBerry Messenger contacts will remain.
To prove it, you can compare the data space or cache at the time before and after the data clear clear data.
For example, when I have not chosen a clear data, the total recorded data at 92,41MB. After cleaning, be 66,32MB. In the cache, prior to cleaning 3,59MB, whereas after the clear cache into 512KB.