Caller ID service in 2 modes:

Postpaid:

The owner of the service, or his agent, who has a telephone service belonging to a digital exchange can contract the service in his Commercial Office, after signing a supplement to the service contract. Rates apply in CUC. ETECSA will deliver an invoice with the amount of monthly consumption (30 calendar days) that must be paid in CUC, or in CUP according to the current exchange rate.

Prepaid:

The request can be made by anyone as long as they pay in advance the amount corresponding to the fixed monthly fee (30 calendar days) of the months they want to use the service.