You know, where you miss a call on your landline and want to call back to see who it was?
Star-69. Yea?
There is caller ID in Taiwan.
As I remember, it was introduced more than ten years ago. We had to contact the telephone company several times to get this function activated.
I do not know if it will be activated by default nowadays.
Anyway star 69 does not work here. The phone has a function button for it.