Support up to five calls simultaneously
| Feature | iPhone 4(GSM) | iPhone 4(CDMA) | Notes |
| Call forwarding | Turn on or off in Settings -> Phone | Dial *72 plus forwarding phone number to turn on. Dail *73 to turn off | |
| Call waiting | Turn on or off in Settings -> Phone | Dial *70 plus the number you are dialing. Dial *70 each time to disable call waiting | |
| Caller ID | Turn on or off in Settings -> Phone | Dial *67 plus the number you are dialing. Dial *67 each time to disable Caller ID | |
| Conference Calls | Support up to two calls simultaneously | CDMA network may not be able to add, swap, or merge calls in certain situations | |
| Dial a soft pause | Tap and hold * when dialing. When editing a contact number, tap +*# and then tap "pause" | Tap and hold * when dialing. When editing a contact number, tap +*# and then tap "pause" | Inserts "." into a phone number. Waits a few seconds before dialing additional digits |
| Dial a hard pause | N/A | Tap and hold # when dialing. When editing a contact number, tap +*# and then tap "wait". | Inserts ";" into a phone number. Waits for the user to tap Dail before dialing the additional digits entered after ";" |
| Place a call on hold | Tap and hold Mute | N/A | CDMA network do not offer the ability to place a call on hold |
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