In Spain each province has a telephone prefix.
When someone calls it is possible to identify the place of origin of the call by looking at the prefix.
Even fixed phones can identify the caller. This service is called (Identificación de llamadas) and it is provided free by most operators.
Below is a list:
There is a utility to find the codes quickly on this page
http://www.infoaboutspain.com/utilities/codigos.php
Prefijos Telefónicos de España - telephone prefixes in Spain.
| Codigo | Provincia |
| Alava | 945 |
| Albacete | 967 |
| Alicante | 96 |
| Almeria | 950 |
| Asturias | 98 |
| Avila | 920 |
| Badajoz | 924 |
| Baleares | 971 |
| Barcelona | 93 |
| Burgos | 947 |
| Caceres | 927 |
| Cadiz | 956 |
| Cantabria | 942 |
| Castellon | 964 |
| Ceuta | 956 |
| CiudadReal | 926 |
| Cordoba | 957 |
| Cuenca | 969 |
| Gerona | 972 |
| Granada | 958 |
| Guadalajara | 949 |
| Guipuzcoa | 943 |
| Huelva | 959 |
| Huesca | 974 |
| Jaen | 953 |
| La Coruna | 981 |
| LaRioja | 941 |
| LasPalmas | 928 |
| Leon | 987 |
| Lerida | 973 |
| Lugo | 982 |
| Madrid | 91 |
| Malaga | 952 |
| Melilla | 952 |
| Murcia | 968 |
| Navarra | 948 |
| Orense | 988 |
| Palencia | 979 |
| Pontevedra | 986 |
| Salamanca | 923 |
| Segovia | 921 |
| Sevilla | 95 |
| Soria | 975 |
| Tarragona | 977 |
| Tenerife | 922 |
| Teruel | 978 |
| Toledo | 925 |
| Valencia | 96 |
| Valladolid | 983 |
| Vizcaya | 94 |
| Zamora | 980 |
| Zaragoza | 976 |