Quick Launch

Whether you're referring to Windows 10 or Windows 10 Mobile, the notification/action center can be managed from the device settings.
 
That's strange: "Mobile" is listed as one of the items listed under Quick actions in my Windows 10 Mobile Lumia 1020 and my sister's Lumia 535 (also W10M).
 
If you want to toggle "Network Selection" or type of data connections allowed... That is in the SIM settings menus.
 

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