Apps themselves, most not all, can be moved and run from your SD card as if it were native storage. The phone will prompt you to format it (this is done while its in the phone itself) and from there apps and files can be moved to it. The phone does not have ONLY 3GB of internal memory however, that is ram NOT storage. Storage on this phone comes in 16GB, 32GB and 64GB though when you get the phone, these numbers will be lower, as Android and some other things that come with the phone, use this storage space as well. Ram is what's used to run your apps and run Android etc. it is NOT used to store the apps.