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if you can change this phone go change it and dont buy sony phones again as they cheat on us ..they say its 4 gb and we can have only 1 gb which almost consumed in pre installed useless apps
but if you will live with xperia c ok we can solve this
first factory reset the phone to remove everything installed now you have the 1 gb free for apps ..go root the phone you will loose waranty btw ..after that install app called root uninstaller ...now remove all usless apps pre installed on internal memory like chrom facebook sony select ..and any app you dont want ...after that open playstore again and reinstall facebook and chrome if you want now they can be moved to sd card and you have good free memory and every app you install remember to move to sd card