Set network options. Go to Settings > Cellular to:
Turn data roaming on or off
Turn cellular data on or off
Turn voice roaming on or off (CDMA)
Use GSM networks abroad (CDMA)
See .
Turn off cellular services. Go to Settings, turn on Airplane Mode, then tap Wi-Fi and turn it
on. Incoming phone calls are sent to voicemail. To resume cellular service, turn Airplane
Mode off.
Make calls to your contacts and favorites while traveling abroad. (GSM) Go to Settings
> Phone, then turn on Dial Assist. Dial Assist automatically adds the prefix or country code
for calls to the U.S.
Select a carrier network. Go to Settings > Carrier. This setting appears on GSM networks
when you’re outside your carrier’s network, and other local carrier data networks are
available to use for your phone calls, visual voicemail, and cellular network Internet
connections. You can make calls only on carriers that have a roaming agreement with your
carrier. Additional fees may apply. Roaming charges may be billed to you by the other
carrier, through your carrier.
Get voicemail when visual voicemail isn’t available. Dial your own number (with CDMA,
add # after your number), or touch and hold “1” on the numeric keypad.
Phone settings
Go to Settings > Phone to:
See the phone number for your iPhone
Change the default text message replies for incoming calls
Turn call forwarding, call waiting, and caller ID on or off (GSM)
Turn TTY on or off
Change your voicemail password (GSM)
Require a PIN to unlock your SIM when you turn iPhone on (required by some carriers)
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