On my iPhone 5s auto-lock "never" is not there as an option.
When I access settings/general/auto-lock I hand the following options
1 minute
2 minutes
3 minutes
4 minutes
5 minutes
but never does not appear as an option.
When I access settings/general/auto-lock I hand the following options
1 minute
2 minutes
3 minutes
4 minutes
5 minutes
but never does not appear as an option.
Do you have Touch ID enabled? Do you have an Exchange account on the device? If you have an Exchange account, it is very possible the Exchange Administrator has set a parameter for that option.
On my iPhone 5s auto-lock "never" is not there as an option.