Country code +30 (dialed as 00 30 from many places) is Greece, but there are no valid numbers beginning with +30 1.
+30 1 was formerly the code for Athens, but those numbers have changed. A number that used to be +30 1 xxx xxxx is now +30 21 0xxx xxxx.
(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
Country code +30 is Greece, but there are no numbers beginning with +30 1.
Before 2002, +30 1 was the area code for Athens, but those old numbers are now +30 210, which means that your number is probably now +30 210 731, with four more digits. Of course, since the number you referenced is now at least 10 years old, it may now belong to someone completely unrelated to the party you're trying to reach.
Telephone country code +1 is North America (USA, Canada, etc.), and telephone area code +1 302 is the US state of Delaware.
(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
Telephone country code +1 is North America, including the USA, Canada, and certain Caribbean-ish islands. Area code +1 301 is the southern and western parts of the state of Maryland, including the Washington, D.C., suburbs, but not including Baltimore or Annapolis. Area code +1 240 is an overlay of +1 301, serving the same area.
Invalid code. +30 is Greece, but no valid numbers begin with +30 0.
The telephone country code for the United States is +1.
Telephone country code +1 is North America, including the USA, Canada, and 18 islands in or near the Caribbean, but there is no area code +1 467. There are no valid telephone numbers beginning with +1 467.
Telephone country code +1 is North America (USA, Canada, etc.), but there are no valid numbers beginning with +1 1.
The country code for North America is +1 (USA, Canada, etc.). As for the country code +1265, it does not exist.
North America (USA, Canada, etc.) is country code +1 because the telephone was invented there.
The telephone country code for Hungary is +36. The area code for Budapest is 1, which is dialed as 06 1 within Hungary, or +36 1 in international format.
No such area code in North America (telephone country code +1 = USA, Canada, etc.).
Country codes never begin with 0, but country code +1, area code 415, is San Francisco, California, USA.
Telephone country code +1 includes the United States, Canada, and several island countries/territories in or near the Caribbean.
Telephone country code +1 is North America, including the USA, Canada, and certain Caribbean/nearby islands. Telephone area code +1 937 is for southwestern Ohio, including Dayton but not including Cincinnati.
Telephone country code +1 is North America (USA, Canada, etc.), but there is no area code 121 in North America. It is an invalid number.
Country code +1 is North America (USA, Canada, etc.), and area code +1 703 is the northern Virginia suburbs of Washington, D.C.