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Historically ISD Calling codes of some countries are revised, and they have allocated different ISD codes. Any how, such codes are discontinued and not in use.
| Country | ISD Code |
|---|---|
| Formerly Aruba – See country code +297 | 5998 |
| Formerly American Samoa – New code +1-684 | 684 |
| Formerly Guam – Now +1-671 | 671 |
| Formerly Sint Maarten – Now +1-721 | 5995 |
| It was assigned to San Marino, see +378 | 295 |
| It was assigned to the European Telephony Numbering Space | 388 |
| It was assigned to the German Democratic Republic (East Germany) until April 1992; this area is now covered by Germany code +49) | 37 |
| It was assigned to Yugoslavia before break-up | 38 |
| Unassigned (formerly used by Inmarsat Atlantic West) discontinued 2008 | 874 |
| Unassigned (formerly used by Inmarsat Indian) discontinued in 2008 | 873 |
| Unassigned (formerly used by Inmarsat Pacific) discontinued in 2008 | 872 |
| Unassigned (formerly used by Inmarsat, Atlantic East) discontinued in 2008 | 871 |
| Unassigned – originally assigned to Dubai now covered under +971 | 978 |
| Unassigned – originally South Yemen now covered under +967 Yemen (formerly North Yemen) | 969 |
| Unassigned, formerly ANAC satellite service | 857 |
| Unassigned, formerly ANAC satellite service | 858 |
| Vatican City assigned, but uses +39 Italy code | 379 |