First, 00 isn't part of the country code or area code, it is a commonly used international dialing prefix.
Telephone country code +1 is North America, including the USA, Canada, and several Caribbean or nearby islands.
Telephone area code +1 383 is unassigned and not in use.
Telephone country code +383 is also unassigned and not in use.
(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.)
There is no telephone area code +1 383 in North America (USA, Canada, etc.).There is no telephone country code +383.(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.)
00 + 1 + Area code + telephone number.
+44
The telephone country code 00 790 is not a valid country code. The prefix "00" is often used as an international dialing prefix in many countries, but "790" does not correspond to any specific country. If you meant to ask about a different code, please clarify.
00 1
Sheffield is UK telephone area code 0114. There are several prefixes in the Stocksbridge area. Additionally, there are several "virtual prefixes" that serve the entire Sheffield area, and with number portability any specific 0114 number could be located anywhere in the greater Sheffield 0114 area, served by any local telephone company.
Essex has several different telephone area codes. To call the UK from the Republic of Ireland, replace the leading 0 of the UK domestic number with 00 44.
There is no telephone country code +302. To call Greece (telephone country code +30) from Saudi Arabia, you dial 00 30.
To call Germany from another country, dial +49 then the German area code and telephone number. Replace the + with 00 if calling from Europe, 011 if calling from US or Canada, etc.
UK telephone area code 01402 is not currently in use.00 1 402 is the dialing code from the UK to Omaha, Nebraska, USA (telephone country code +1, area code 402).(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.)
The method differs in different countries. In many countries you prefix the country code by two zeros or a plus. then the country code then the telephone number, omitting any leading zeros in the area code. So to call the Swedish meterological insitute in Norrköping Sweden from a United States land line you would dial: 00 (international) 46 (that's the country code for Sweden) 11 (the area code for Norrköping is 011- drop that initial zero) 495 80 00 (the number you would have dialed if you had been in the Norrköping area code)
Assuming you mean either Portland, Maine, or Portland, Oregon, dial 00 1 and then the 3-digit area code and 7-digit subscriber number. Portland ME is in area code 207; Portland OR is in area codes 503 and 971.