Caller ID (or CLI, CND, CLIP), is a service that transmits a caller's number to the called party's telephone equipment during the ringing signal, or when the call is being set up but before the call is answered.

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Phone number shown as unknown. Always says sender is invalid

I have a Samsung Galaxy S SHW-M1105 and it displays my phone number as unknown. Is there a way to change it? And one more when I try to reply a message it says the sender is invalid. Someone please ...
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Sony Xperia Z won't name contacts on incoming calls

Whenever on of my contacts ring my phone, it does not display the caller ID and simply marks them as "Unknown". I don't mean saying the contacts name out loud either- I just mean the caller ID isn't ...