How do I turn on call waiting on an iPhone 4?

[iMore Question]

how do i turn on call waiting on an i phone 4

when i try to do it it says it cant be saved

 

[kch50428]

Re: how do i turn on call waiting on an i phone 4

Call Waiting depends on your carrier... if it's a GSM system - you can turn it on/off in settings>>Phone... if CDMA - Sprint/Verizon - there are star codes you have to dial to turn on or off various things like call waiting - consult you carrier.