Archived Gibraltar Regulatory Authority website
0034 DIALING
As from 10th February 2007, telephone subscribers in Gibraltar will only be able to call telephone numbers in Spain by dialling 0034 before the 9-digit Spanish number. With effect from that date, calls from Gibraltar to Spain will no longer be made by dialling the 9-digit Spanish subscriber's number only. It is important to stress that telephone calls to Spain will not be more expensive as a result of the change. For information on tariffs please refer to the Gibraltar Telephone Directory. Also as from 10th February, callers from Spain dialling Gibraltar will be required to use 00350, plus the customer number.