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When ringing other numbers, my phone number does not display on the receivers phone.
I tried going into settings ... phone, but I cannot change "Show My Caller ID" to ON (or black)
Any ideas
You may need to contact your cellular carrier to activate Caller ID. What provider do you have?
Edit: You can try this.
1. Turn Airplane Mode on.
2. Go to the setting for caller ID. Is it still greyed out? If not, turn it on.
3. Turn Airplane Mode off.
4. If it was still greyed out during step 2, try now.

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