| 1925 | 
United States | 
United Kingdom - NGN - National | 
0.2136 | 
No change | 
0.0 | 
| 1928 | 
United States | 
United Kingdom - NGN - National | 
0.2136 | 
No change | 
0.0 | 
| 1929 | 
United States | 
United Kingdom - NGN - National | 
0.2136 | 
No change | 
0.0 | 
| 1930 | 
United States | 
United Kingdom - NGN - National | 
0.2136 | 
No change | 
0.0 | 
| 1931 | 
United States | 
United Kingdom - NGN - National | 
0.2136 | 
No change | 
0.0 | 
| 1934 | 
United States | 
United Kingdom - NGN - National | 
0.2136 | 
No change | 
0.0 | 
| 1936 | 
United States | 
United Kingdom - NGN - National | 
0.2136 | 
No change | 
0.0 | 
| 1937 | 
United States | 
United Kingdom - NGN - National | 
0.2136 | 
No change | 
0.0 | 
| 1938 | 
United States | 
United Kingdom - NGN - National | 
0.2136 | 
No change | 
0.0 | 
| 1940 | 
United States | 
United Kingdom - NGN - National | 
0.2136 | 
No change | 
0.0 | 
| 1941 | 
United States | 
United Kingdom - NGN - National | 
0.2136 | 
No change | 
0.0 | 
| 1943 | 
United States | 
United Kingdom - NGN - National | 
0.2136 | 
No change | 
0.0 | 
| 1945 | 
United States | 
United Kingdom - NGN - National | 
0.2136 | 
No change | 
0.0 | 
| 1947 | 
United States | 
United Kingdom - NGN - National | 
0.2136 | 
No change | 
0.0 | 
| 1949 | 
United States | 
United Kingdom - NGN - National | 
0.2136 | 
No change | 
0.0 | 
| 1951 | 
United States | 
United Kingdom - NGN - National | 
0.2136 | 
No change | 
0.0 | 
| 1952 | 
United States | 
United Kingdom - NGN - National | 
0.2136 | 
No change | 
0.0 | 
| 1954 | 
United States | 
United Kingdom - NGN - National | 
0.2136 | 
No change | 
0.0 | 
| 1956 | 
United States | 
United Kingdom - NGN - National | 
0.2136 | 
No change | 
0.0 | 
| 1959 | 
United States | 
United Kingdom - NGN - National | 
0.2136 | 
No change | 
0.0 | 
| 1970 | 
United States | 
United Kingdom - NGN - National | 
0.2136 | 
No change | 
0.0 | 
| 1971 | 
United States | 
United Kingdom - NGN - National | 
0.2136 | 
No change | 
0.0 | 
| 1972 | 
United States | 
United Kingdom - NGN - National | 
0.2136 | 
No change | 
0.0 | 
| 1973 | 
United States | 
United Kingdom - NGN - National | 
0.2136 | 
No change | 
0.0 | 
| 1978 | 
United States | 
United Kingdom - NGN - National | 
0.2136 | 
No change | 
0.0 | 
| 1979 | 
United States | 
United Kingdom - NGN - National | 
0.2136 | 
No change | 
0.0 | 
| 1980 | 
United States | 
United Kingdom - NGN - National | 
0.2136 | 
No change | 
0.0 | 
| 1983 | 
United States | 
United Kingdom - NGN - National | 
0.2136 | 
No change | 
0.0 | 
| 1984 | 
United States | 
United Kingdom - NGN - National | 
0.2136 | 
No change | 
0.0 | 
| 1985 | 
United States | 
United Kingdom - NGN - National | 
0.2136 | 
No change | 
0.0 | 
| 1986 | 
United States | 
United Kingdom - NGN - National | 
0.2136 | 
No change | 
0.0 | 
| 1989 | 
United States | 
United Kingdom - NGN - National | 
0.2136 | 
No change | 
0.0 | 
| 1907 | 
United States - Alaska | 
United Kingdom - NGN - National | 
0.2136 | 
No change | 
0.0 | 
| 1544 | 
United States - CLEC | 
United Kingdom - NGN - National | 
0.2136 | 
No change | 
0.0 | 
| 1566 | 
United States - CLEC | 
United Kingdom - NGN - National | 
0.2136 | 
No change | 
0.0 | 
| 223 | 
Mali | 
United Kingdom - NGN - National | 
0.3161 | 
No change | 
0.0 | 
| 230 | 
Mauritius | 
United Kingdom - NGN - National | 
0.3161 | 
No change | 
0.0 | 
| 373 | 
Moldova | 
United Kingdom - NGN - National | 
0.3161 | 
No change | 
0.0 | 
| 382 | 
Montenegro | 
United Kingdom - NGN - National | 
0.3161 | 
No change | 
0.0 | 
| 258 | 
Mozambique | 
United Kingdom - NGN - National | 
0.3161 | 
No change | 
0.0 | 
| 95 | 
Myanmar | 
United Kingdom - NGN - National | 
0.3161 | 
No change | 
0.0 | 
| 1869 | 
Nevis & St. Kitts | 
United Kingdom - NGN - National | 
0.3161 | 
No change | 
0.0 | 
| 968 | 
Oman | 
United Kingdom - NGN - National | 
0.3161 | 
No change | 
0.0 | 
| 680 | 
Palau | 
United Kingdom - NGN - National | 
0.3161 | 
No change | 
0.0 | 
| 970 | 
Palestine | 
United Kingdom - NGN - National | 
0.3161 | 
No change | 
0.0 | 
| 63 | 
Philippines | 
United Kingdom - NGN - National | 
0.3161 | 
No change | 
0.0 | 
| 974 | 
Qatar | 
United Kingdom - NGN - National | 
0.3161 | 
No change | 
0.0 | 
| 262 | 
Reunion Island | 
United Kingdom - NGN - National | 
0.3161 | 
No change | 
0.0 | 
| 966 | 
Saudi Arabia | 
United Kingdom - NGN - National | 
0.3161 | 
No change | 
0.0 | 
| 381 | 
Serbia | 
United Kingdom - NGN - National | 
0.3161 | 
No change | 
0.0 | 
| 27 | 
South Africa | 
United Kingdom - NGN - National | 
0.3161 | 
No change | 
0.0 | 
| 94 | 
Sri Lanka | 
United Kingdom - NGN - National | 
0.3161 | 
No change | 
0.0 | 
| 1758 | 
St. Lucia | 
United Kingdom - NGN - National | 
0.3161 | 
No change | 
0.0 | 
| 1721 | 
St. Maarten | 
United Kingdom - NGN - National | 
0.3161 | 
No change | 
0.0 | 
| 508 | 
St. Pierre & Miquelon | 
United Kingdom - NGN - National | 
0.3161 | 
No change | 
0.0 | 
| 1784 | 
St. Vincent & Grenadines | 
United Kingdom - NGN - National | 
0.3161 | 
No change | 
0.0 | 
| 249 | 
Sudan | 
United Kingdom - NGN - National | 
0.3161 | 
No change | 
0.0 | 
| 597 | 
Suriname | 
United Kingdom - NGN - National | 
0.3161 | 
No change | 
0.0 | 
| 963 | 
Syria | 
United Kingdom - NGN - National | 
0.3161 | 
No change | 
0.0 | 
| 992 | 
Tajikistan | 
United Kingdom - NGN - National | 
0.3161 | 
No change | 
0.0 | 
| 993 | 
Turkmenistan | 
United Kingdom - NGN - National | 
0.3161 | 
No change | 
0.0 | 
| 1649 | 
Turks & Caicos | 
United Kingdom - NGN - National | 
0.3161 | 
No change | 
0.0 | 
| 380 | 
Ukraine | 
United Kingdom - NGN - National | 
0.3161 | 
No change | 
0.0 | 
| 971 | 
United Arab Emirates | 
United Kingdom - NGN - National | 
0.3161 | 
No change | 
0.0 | 
| 998 | 
Uzbekistan | 
United Kingdom - NGN - National | 
0.3161 | 
No change | 
0.0 | 
| 888 | 
Voxbone - UN | 
United Kingdom - NGN - National | 
0.3161 | 
No change | 
0.0 | 
| 967 | 
Yemen Arab Republic | 
United Kingdom - NGN - National | 
0.3161 | 
No change | 
0.0 | 
| 263 | 
Zimbabwe | 
United Kingdom - NGN - National | 
0.3161 | 
No change | 
0.0 | 
| 672 | 
Antarctica & Islands | 
United Kingdom - NGN - National | 
0.5592 | 
No change | 
0.0 | 
| 1268 | 
Antigua & Barbuda | 
United Kingdom - NGN - National | 
0.5592 | 
No change | 
0.0 | 
| 247 | 
Ascension Island | 
United Kingdom - NGN - National | 
0.5592 | 
No change | 
0.0 | 
| 1242 | 
Bahamas | 
United Kingdom - NGN - National | 
0.5592 | 
No change | 
0.0 | 
| 375 | 
Belarus | 
United Kingdom - NGN - National | 
0.5592 | 
No change | 
0.0 | 
| 229 | 
Benin | 
United Kingdom - NGN - National | 
0.5592 | 
No change | 
0.0 | 
| 226 | 
Burkina Faso | 
United Kingdom - NGN - National | 
0.5592 | 
No change | 
0.0 | 
| 257 | 
Burundi | 
United Kingdom - NGN - National | 
0.5592 | 
No change | 
0.0 | 
| 236 | 
Central African Republic | 
United Kingdom - NGN - National | 
0.5592 | 
No change | 
0.0 | 
| 235 | 
Chad | 
United Kingdom - NGN - National | 
0.5592 | 
No change | 
0.0 | 
| 269 | 
Comoros | 
United Kingdom - NGN - National | 
0.5592 | 
No change | 
0.0 | 
| 242 | 
Congo | 
United Kingdom - NGN - National | 
0.5592 | 
No change | 
0.0 | 
| 243 | 
Congo (DR) | 
United Kingdom - NGN - National | 
0.5592 | 
No change | 
0.0 | 
| 53 | 
Cuba | 
United Kingdom - NGN - National | 
0.5592 | 
No change | 
0.0 | 
| 246 | 
Diego Garcia | 
United Kingdom - NGN - National | 
0.5592 | 
No change | 
0.0 | 
| 253 | 
Djibouti | 
United Kingdom - NGN - National | 
0.5592 | 
No change | 
0.0 | 
| 670 | 
East Timor | 
United Kingdom - NGN - National | 
0.5592 | 
No change | 
0.0 | 
| 240 | 
Equatorial Guinea | 
United Kingdom - NGN - National | 
0.5592 | 
No change | 
0.0 | 
| 251 | 
Ethiopia | 
United Kingdom - NGN - National | 
0.5592 | 
No change | 
0.0 | 
| 679 | 
Fiji Island | 
United Kingdom - NGN - National | 
0.5592 | 
No change | 
0.0 | 
| 241 | 
Gabon Republic | 
United Kingdom - NGN - National | 
0.5592 | 
No change | 
0.0 | 
| 220 | 
Gambia | 
United Kingdom - NGN - National | 
0.5592 | 
No change | 
0.0 | 
| 233 | 
Ghana | 
United Kingdom - NGN - National | 
0.5592 | 
No change | 
0.0 | 
| 224 | 
Guinea | 
United Kingdom - NGN - National | 
0.5592 | 
No change | 
0.0 | 
| 245 | 
Guinea Bissau | 
United Kingdom - NGN - National | 
0.5592 | 
No change | 
0.0 | 
| 509 | 
Haiti | 
United Kingdom - NGN - National | 
0.5592 | 
No change | 
0.0 | 
| 883 | 
Intl Networks | 
United Kingdom - NGN - National | 
0.5592 | 
No change | 
0.0 | 
| 882 | 
Intl Shared | 
United Kingdom - NGN - National | 
0.5592 | 
No change | 
0.0 | 
| 0 | 
Invalid | 
United Kingdom - NGN - National | 
0.5592 | 
No change | 
0.0 | 
| 881 | 
Iridium | 
United Kingdom - NGN - National | 
0.5592 | 
No change | 
0.0 | 
| 225 | 
Ivory Coast | 
United Kingdom - NGN - National | 
0.5592 | 
No change | 
0.0 | 
| 1658 | 
Jamaica | 
United Kingdom - NGN - National | 
0.5592 | 
No change | 
0.0 |