User guide

Chapter 33 Settings 135
Cellular
Use Cellular settings to turn cellular data and roaming on or o, to set up Personal Hotspot, and
to set cellular data options.
When an app needs to use the Internet, iPhone does the following, in order, until connected:
•
Connects over the most recently used available Wi-Fi network.
•
Shows a list of Wi-Fi networks in range, and connects using the one you choose.
•
Connects over the cellular data network, if available.
If iPhone is connected to the Internet via the cellular data network, the , , , , or icon
appears in the status bar.
LTE, 4G and 3G service on GSM cellular networks support simultaneous voice and data
communications. For all other cellular connections, you can’t use Internet services while you’re
talking on the phone unless iPhone also has a Wi-Fi connection to the Internet. Depending on
your network connection, you may not be able to receive calls while iPhone transfers data over
the cellular network—when downloading a webpage, for example.
GSM networks: On an EDGE or GPRS connection, incoming calls may go directly to voicemail
during data transfers. For incoming calls that you answer, data transfers are paused.
CDMA networks: On EV-DO connections, data transfers are paused when you answer incoming
calls. On 1xRTT connections, incoming calls may go directly to voicemail during data transfers.
For incoming calls that you answer, data transfers are paused.
Data transfer resumes when you end the call.
If Cellular Data is o, all data services use only Wi-Fi—including email, web browsing, push
notications, 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 o: Go to Settings > General > Cellular. The following options may also
be available:
•
Turn Voice Roaming on or o (CDMA): Turn Voice Roaming o 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 o: 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 o Data Roaming to avoid roaming charges. See Carrier on page 133.
•
Enable or disable 3G: Using 3G 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 3G o to
extend battery life. This option is not available in all areas.
Set up Personal Hotspot: Go to Settings > General > Cellular > Set Up Personal Hotspot.
Personal Hotspot shares iPhone’s Internet connection with your computer and other iOS devices.
See Personal Hotspot on page 132.
Set when cellular data is used: Go to Settings > General > Cellular, then turn cellular data on or
o for iCloud Documents, iTunes, FaceTime, Passbook Updates, or Reading List. If a setting is o,
iPhone will use only Wi-Fi for that service. The iTunes settings includes both iTunes Match and
automatic downloads from the iTunes Store and the App Store.