Data transfer resumes when you end the call.
If Cellular Data is off, all data services use only Wi-Fi—including email, web browsing, push
notifications, and other services. If Cellular Data is on, carrier charges may apply. For
example, using certain features and services that transfer data, such as Siri and Messages,
could result in charges to your data plan.
Turn Cellular Data on or off. Go to Settings > Cellular, then tap Cellular Data. The
following options may also be available:
Turn Voice Roaming on or off (CDMA): Turn Voice Roaming off to avoid charges from
using other carrier’s networks. When your carrier’s network isn’t available, iPhone won’t
have cellular (data or voice) service.
Turn Data Roaming on or off: Data Roaming permits Internet access over a cellular data
network when you’re in an area not covered by your carrier’s network. When you’re
traveling, you can turn off Data Roaming to avoid roaming charges. See .
Enable or disable 4G/LTE (varies by carrier): Using 4G or LTE loads Internet data faster
in some cases, but may decrease battery performance. If you’re making a lot of phone
calls, you may want to turn 4G/LTE off to extend battery life. This option is not available
in all areas. On iPhone SE, iPhone 6, iPhone 6 Plus, and later, there are options for
turning off 4G/LTE or for selecting Voice & Data (VoLTE) or Data Only.
Voice & Data (some carriers): Choose LTE to load data faster. (This also turns on
VoLTE.) Choose slower speeds to increase battery life.
Set up Personal Hotspot: Personal Hotspot shares the Internet connection on iPhone
with your computer and other iOS devices. See .
Turn Wi-Fi Assist on or off: If Wi-Fi connectivity is poor, Wi-Fi Assist uses cellular data
to boost the signal.
Note: Using data over a cellular network may incur additional fees.
Set whether cellular data is used for apps and services. Go to Settings > Cellular, then
turn cellular data on or off for any app that can use cellular data. If a setting is off, iPhone
uses only Wi-Fi for that service. The iTunes setting includes both iTunes Match and
automatic downloads from the iTunes Store and the App Store.
Sell or give away iPhone
Before you sell or give away your iPhone, be sure to back it up (see ), then
Phone settings
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