I am unable to update my iphone 6s

Try asking apple if your iPhone 6s is able to get any new software I know some iPhones are unable to update to the latest update if your iPhone is able to get new software but unable to update contact apple and get a case number

Hi tarique, don’t be concerned about your iCloud being full. Software updates are installed on the internal storage of your iPhone, not in iCloud. That being said, may you please go into Settings -> General -> iPhone storage and tell us how much storage your phone has and how much of it is available?

While you can ask Apple, they will say the same thing that has been posted in this thread already. An iPhone 6S can be updated to the latest version of iOS, which is iOS 14.6.

tarique176 wrote:

how to make free space in iCloud?

If iCloud is full, just add more storage to it. You can update it to 50 GB for 99¢ a month, or the equivalent in local currency. Go to Settings/[your name]/iCloud - Manage Storage.

Read what the screen says...

You must have sufficient free space, you must be connected to WiFi, and you must have at least 50% battery charge...

What happens when you try?

If it tells you you're up to date running 12.5.4, you do not have a 6s. You have a 6 or a 6 Plus.

Your "cloud" has nothing to do with it.

You MUST be connected to WiFi to update over the air.

You “rent” iCloud space month by month, and pay the fee each month.