iPhone 4S usually has 16GB, 32GB and 64GB capacity. Since iPhone 4S does not support external memory card, all data will be stored to iPhone 4S internal memory no matter you use it to take pictures, receive messages, download movies / music or install any program on your iPhone 4S. Sometimes, when you attempt to save new data or install an application on your iPhone 4S, you may receive message showing there is not enough available storage to take photos or download anything. You may check the storage space of your iPhone 4S and it shows only 0 byte storage available. What can you do to fix the problem that iPhone 4S shows 0 byte storage available and disables you to save any data?
How to check how much storage space is used or left on our iPhone 4S? You just need to click "Settings" on your iPhone 4S > click "General" > click "About" option, and then you can see the used storage and available storage on your iPhone 4S. If the available storage shows 0 byte, you can check how many programs and other types of files such as photos, videos, etc have been stored on your iPhone 4S. On the "About" screen, it shows the details of all data that has been stored on your iPhone 4S.
On some other iPhone like iPhone 5 and iPhone 6, you can check its storage space by clicking "Settings" on iPhone > click "General" option > click "Usage" option and then you can see the used and available storage on your iPhone.
It is an annoying thing that iPhone 4S shows 0 byte space. Here is something you can do to free up storage space on your iPhone 4S:
Sometimes, you may find that your iPhone 4S still shows 0 byte space after deleting some or even all files from your device. What is wrong? In this situation, you may check if your iPhone 4S is infected with virus after jailbreak or installing some spyware. Virus infection might occupy storage space on your iPhone 4S and even cause unexpected trouble to your device. Therefore, if your iPhone 4S keeps saying 0 byte space though there is little data stored on it, you had better run Apple built-in antivirus software to check if your iPhone 4S is attacked by virus.
When you delete files to free up space on iPhone 4S when it shows 0 byte storage, you may mistakenly delete some important data sometimes. If your iPhone 4S has been attacked by virus, there is a risk of all data loss from the virus infection. If you lose any precious data caused by 0 byte storage on iPhone 4S, you can restore data from iPhone by any of following methods: