How do I turn on my caller ID on iPhone 6S plus?

If you mean that the caller ID does not show on the phone of any person you are calling, how you enable that depends on your cellular carrier. With some carriers you can turn it off via an option in Settings > Phone. With other carriers you need to do it via their website or their customer support.

Hi

Go to settings

Down to phone icon next to messages click on icon to bring up list

Show my ID

Cheers

Brian (uk)

Briansyddall wrote:

Hi

Go to settings

Down to phone icon next to messages click on icon to bring up list

Show my ID

Cheers

Brian (uk)

True for some carriers -- not true for my carrier.

I just ran into the same problem with my new iPhone 6. I checked with AT&T and to resolve it, I enabled LTE for Data Only.

Go to settings

Select Cellular

Select Enable LTE

Select Data Only