How do I set my iPhone 8 so that it uses only talk and text (on the Voice 35 Plan) but doesn’t use data?

I have two phones on the Voice 35 plan. They are iPhone 8’s.  I want to set them so that the phones can be used for calls, SMS and MMS, but not for other data.  In other words, I want to ensure they don’t incur additional charges.  What settings do I need to ensure I can fully take advantage of the Voice 35 plan, but with no additional data charges?




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