Now there is a file management software or application which manages the files and shows them to us. When we delete a file it remains on the internal storage only in its deleted form but does not appear to us.
It is interesting to note that there are some softwares using which we can recover these files and bring them back in sight.
Please note that as the internal storage is also limited so it will not be able to keep all the deleted files in it in that hidden avatar and some files will be deleted permanently in order of their seniority of deletion or size.
So it is the software that is making us to feel that the files are deleted. Many of them especially those deleted recently are existing there only in hidden form.
In our laptops or desktops we have a recycle bin which acts as a buffer between and we can recover the files back easily but once they are deleted we have to use special applications to track them and recover them.
Investigating agencies use specialised software to retrieve the deleted data in the mobiles and computers if that still exist in that hidden form.
Please also note that when you format the internal storage all the data is lost and that is the reason that we are advised to keep a copy of the data in some external hard drive or pen drive before we format.
Knowledge is power.
When we delete something from the smartphone also, the matter will get erased and you will not find the matter in the concerned file. I think any software specialist can throw much light on this issue.
However this deletion goes through certain stages till is fully deleted irrecoverably.
Thus 'Re-cycle bin' is a temporary stage where the deleted dat goes first. This is a protection to retrieve any data deleted by mistake. So when a data is deleted and sent to Re-cycle bin, the space saving is not there. The same has to be deleted from recycle bin also to get back the space. There are certain software where one can retrieve the deleted data.