You can use different methods to turn on these features, depending on your wireless carrier's network technology (GSM or CDMA):
| Feature | iPhone (GSM networks) | iPhone (CDMA networks) | Notes |
|---|---|---|---|
| Call forwarding | Turn on or off in Settings > Phone. |
Contact your carrier for information on using Call Forwarding. | To see if call forwarding is turned on, look for this icon  in the status bar. |
| Call waiting | Turn on or off in Settings > Phone. |
Contact your carrier for information on using Call Waiting. | |
| Caller ID | Turn on or off in Settings > Phone. |
Contact your carrier for information on using Caller ID. | |
| Conference calls | Supports up to five calls simultaneously | Supports up to two calls simultaneously. | CDMA networks may not be able to add, swap, or merge calls in certain situations. See the iPhone user guide for more details. |
| Dial a soft pause | Tap and hold * when you dial. When you edit a contact number, tap +*#, then tap "pause." | Inserts "," into a phone number and waits a few seconds before dialing the additional digits. | |
| Dial a hard pause | Tap and hold # when dialing. When editing a contact number, tap +*#, then tap "wait." | Inserts ";" into a phone number and waits for the user to tap Dial before dialing the additional digits. | |
| Place a call on hold | Tap and hold Mute. | N/A | You can't place a call on hold on CDMA networks. |
Learn more about differences using cellular data networks, including LTE.