User's Manual

Appendix F Safety, handling, and support 200
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 > Cellular, then tap Cellular Data. 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 Phone settings on page 59.
•
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 o to extend battery life. This option is not available in all areas. On
iPhone 6 and iPhone 6 Plus, there are options for turning o 4G/LTE, selecting Voice & Data
(VoLTE), or Data Only.
•
Voice & Data (some carriers): Choose LTE to load data faster. 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 Personal Hotspot on page 42.
Set whether cellular data is used for apps and services. Go to Settings > Cellular, then turn
cellular data on or o for any app that can use cellular data. If a setting is o, 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 erase all content and your personal
information. If you’ve enabled Find My iPhone (see Find My iPhone on page 47), Activation Lock
is on. You need to turn o Activation Lock before the new owner can activate iPhone under his
or her own account.
Erase iPhone and remove Activation Lock. Go to Settings > General > Reset > Erase All Content
and Settings.
See support.apple.com/kb/HT5661.
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