“Free Call” Indicator

You know, of course, that in general, cellphone calls to other people who have the same carrier as you are free, right?

But how do you KNOW when somebody with the same carrier calls you?

“In the iPhone address book, change the ‘mobile’ label for the caller’s contact info to ‘AT&T mobile,’ and that’s what will show up on your phone when she or he calls. Once you make this change for one contact, ‘AT&T mobile’ will show up as a custom label option for any contact.”

David Pogue's technology column

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