Update software in iTunes. iTunes checks for available software updates each time you
sync iPhone using iTunes. See .
For more information about updating iPhone software, see .
Restore iPhone
You can use iCloud or iTunes to restore iPhone from a backup.
Restore from an iCloud backup. Reset iPhone to erase all content and settings, then
choose Restore from a Backup and sign in to iCloud in Setup Assistant. See .
Restore from an iTunes backup. Connect iPhone to the computer you normally sync with,
select iPhone in the iTunes window, then click Restore in the Summary pane.
When the iPhone software is restored, you can either set it up as a new iPhone, or restore
your music, videos, app data, and other content from a backup.
For more information about restoring iPhone software, see .
Cellular settings
Use Cellular settings to turn cellular data and roaming on or off, set which apps and services
use cellular data, see call time and cellular data usage, and set other cellular options.
If iPhone is connected to the Internet via the cellular data network, the LTE, 4G, 3G, E, or
GPRS 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.
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