I have an iPhone 4S and the show my caller ID button is greyed out. I tried to switch it on but it won't move off grey... Any idea.?
iPhone 5
Posted on Mar 5, 2014 1:37 PM
Q: Caller id
You must be using a CDMA carrier, which means you need to contact your cellular carrier.
See http://support.apple.com/kb/HT4515
Not all carriers support controlling that from the phone.
