Turning data on your iPhone provides access to online services over the cellular network, while turning it off will impact that experience unless connected to Wi-Fi.
Open the
Settings app
on your Apple
® iPhone
®.
Tap the
Cellular Data switch
to turn on or off.
To allow your iPhone to use data while roaming, tap
Cellular Data Options
then tap the switch to turn on or off.
For Dual SIM, tap
Cellular Data
then tap
Off
.
Cellular data can be turned on or off by the specific service (e.g., App Store®, Mail, Music, etc.).
For assistance with turning data on or off for individual apps, refer to
Manage Data Usage.