[iMore Question]

When I try to sync with ITunes on my S6 plus it gives me an error message saying my iPhone needs to update. How do I do this? And how do I keep from using data when not on my phone?

[Ledsteplin]

Go to Settings >General > Software Updates > check for update.
iTunes has to be updated on the computer.
Data use:
Go to Settings > Cellular > scroll way down and toggle off "WiFi Assist".
Toggle off anything else there you don't need to have.
You shouldn't be using data while not using the phone off wifi.