Software update

Go to Settings/General and scroll to the bottom. Do you see an entry for Profiles or Device Management?

And is your phone jailbroken?

Ryker_ Said:

"Software update: Why can’t I find my software update option in my general settings?"

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Problem put aside, try updating using you computer:

Update Using a Computer:

Have a Computer Handy? If so, try using a computer to update. Go here: Making Use of a Computer for Updating an iOS Device - User Tip

Was this a phone that you bought NEW directly from Apple or an Apple authorized reseller? If there is no business account on the phone the most common reason for this issue is if the phone has been hacked or jailbroken by you or before you acquired it.

Do you have a business email account on your phone, or is it being managed by your company or school under an MDM (Mobile Device Management) program?

Ryker_ Said:

"Software update: Why can’t I find my software update option in my general settings?"

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Reset the Home Screen Layout:

Try performing the following. By doing so, things will be placed back to how they should be.

1. Go to: Settings
2. Tap: General
3. Tap: Reset
4. Tap: Reset Home Screen Layout

Is it back?

Idk it could have something to do with restrictions, i have that issue also— try restarting your iPhone

Windows 7 to 10 with iTunes installed, or a Mac.

Ryker_ Said:

"Any computer or specifically Mac?"

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Either Windows or a Mac will work.