APN

You can only change or set the APN settings if your carrier allows it.

Please review the information is this guide by Apple for more information on APN Settings ➔ View and edit your Access Point Name (APN) on your iPhone - Apple Support.

Axel F.

If you do not see the options then (as the link in my response above states) you will need to contact your carrier. The carrier controls the action whether it will give the user (you) the ability to modify the APN. Please contact your carrier. Thanks.

Axel F.

In mine its in settings->mobile data->mobile data network

heard in some countries its cellular rater than mobile data