My memory is too low.

[AC Question]

What can I do to free up more memory

 

[anon(632115)]

Remove apps/files is all you can do

 

[anon(870071)]

What can I do to free up more memory

Use cloud services like dropbox. And set phone to automatically upload to cloud.

 

[Rukbat]

Memory (RAM) or storage? They're not the same thing.

If memory is too low, something is wrong, because no one is writing 4GB apps (or even 2GB apps). If storage is too low then, as has been said, remove files and uninstall apps. You can't fill a bottle, then add more to it, you have to pour some out first.