There are several ways to minimize, not completely remove the problem, one of which is rooteando the phone and uninstalling applications that you do not use or move some apps to sd with root Uninstaller.
Then there roms like cyanogenmod that optimize memory space, being more "consistent" with somewhat limited memory phones.
There are other methods, but also involve some advanced knowledge. The fastest is to try to root and from there, to do stuff.