How to find missing data roaming button on iPhone 15 Plus?

Look in Settings/Cellular/Cellular Data Options.

If you don’t see the Data Roaming switch that means your carrier hasn’t enabled Roaming. Contact them to get this corrected.

Lyn6652 wrote:

im missing the data roaming button on my apple 15 phone. How do I find it?

If you don't see it in settings - cellular, then you'll need to contact your cellular data provider.