Caller ID on landline phones relies on signals from the telephone service provider. Some companies charge extra if you wish to enable the service, others include it automatically, so you need to check with them first.
Even if you have caller ID enabled, callers can choose to withhold their number. Large companies which make lots of outgoing calls (especially cold callers) often have their service set to automatically withhold their number. In many countries, all other callers can choose to do so by prefixing all dialled numbers with a short code, e.g. in the UK it's 141. Mobile phone callers can usually alter a setting on their handset so that caller ID is withheld when making outgoing calls.
Depending on your telephone provider; you may have to order "Caller ID" as a separate add-in package. Most carriers will provide this service, but require you to say that you want it on your phone. Just because your phone has a caller id screen doesn't mean that it will work right out of the box.
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