IPhone 4S outgoing calls say no caller ID?

Show caller ID is on but every few phone calls I make the person I'm calling says that it says "No Caller ID". I know they're not joking because I've called various other phones right I front of me to see it happening and it still happens. Why is it doing it? And how can I fix it?

- Thanks

Why are you using an iPhone in the first place?

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