blocking my number

How do I block my number from being able to be seen on someone's caller I.D.on a SE 44 slider phone?

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Originally Posted by minkmink_84

dial *67 first

That's correct, *67 blocks your number from being delivered to the caller id, but I'd like to point out that one time I did this and left someone a voicemail, and the person's voicemail told them the message was sent from my phone number.