Not updating to ios 6
According to Tech Advisor website, the update requires at least 1.4GB of free space.
The space is used primarily during the installation process to store the temporary file.
But the reward stays the same, while the risk gets higher, the older your phone is.
If you're happy with the way your phone is running, there's little need to take that risk.
The first group who shouldn't upgrade: Jailbreakers.
I've never jailbroken my phone, mostly because it sounds like a lot of work, but a number of my friends are incredibly loyal to the procedure.
To see how much space you have available on your i Phone, tap the "Settings" icon, choose "General" and select "Usage." If you don't have at least 1.4GB of available space, you need to clear some items off your phone.
The second and much larger group is people like me who have an older device (two more more models behind the current flagship) who are happy with its current performance.If you are having trouble updating your i Phone 4 to run i OS 7, the problem can usually be resolved at home without a trip to an Apple Store for support.One of the most common barriers to installing i OS 7 on an i Phone 4 is available space.And given the speed at which Apple has been rolling out i OS updates lately, and then more rushed updates to fix the bugs in those updates, it's not unthinkable that an update could bring new vulnerabilities too, as we saw with mac OS High Sierra.If you're happy with your older i Phone, it's fine to leave it be.