| Country | Code | City/Area Code |
| Gabon | [241] | Libreville* |
| Gambia, The | [220] | Banjul* |
| Georgia (DST) | [995] | Tbilisi (32) |
| Berlin (30) | ||
| Bonn (228) | ||
| Bremen (421) | ||
| Cologne (221) | ||
| Dresden (351) | ||
| Dusseldorf (211) | ||
| Essen (201) | ||
| Frankfurt am Main (69) | ||
| Germany (DST) | [49] | Freiburg (761) |
| Hamburg (40) | ||
| Hannover (511) | ||
| Heidelberg (6221) | ||
| Leipzig (341) | ||
| Munich (89) | ||
| Postdam (331) | ||
| Stuttgart (711) | ||
| Wiesbaden (611) | ||
| Ghana | [233] | Accra (21) |
| Kumasi (51) | ||
| Gibraltar (DST) | [350] | Gibraltar* (5-digit numbers) |
| Greece (DST) | [30] In 2002, the trunk prefix ‘2’ (‘0’ until October 2002) plus an area code plus a local number = new 10- digit national number.As of October 2002, the prefix ‘2’ is required even for international calls to Greece. |
Athens* |
| Greenland†† (DST) | [299] | Nuuk (Godthaab)* |
| Grenada | [1] | St. George’s (473)** (7-digit numbers) |
| Guadeloupe | [590] | Basse-Terre (81) (10-digit numbers) |
| Guam | [1] | Agana (671)** (7-digit numbers) |
| Guatemala | [502] | Guatemala City* (7-digit numbers) |
| Guinea | [224] | Conakry* |
| Guinea-Bissau | [245] | Bissau* (6-digit numbers) |
| Guyana | [592] | Georgetown* (7-digit numbers) |