Country codes beginning with +3 (dialed as 00 3 from many places) are in Europe, but you need the full two- or three-digit code to be specific.
+30 = Greece
+31 = Netherlands
+32 = Belgium
+33 = France
+34 = Spain
+35 = (see below)
+36 = Hungary
+37 = (see below)
+38 = (see below)
+39 = Italy
+350 = Gibraltar
+351 = Portugal
+352 = Luxembourg
+353 = Republic of Ireland
+354 = Iceland
+355 = Albania
+356 = Malta
+357 = Cyprus
+358 = Finland
+359 = Bulgaria
+370 = Lithuania
+371 = Latvia
+372 = Estonia
+373 = Moldova
+374 = Armenia
+375 = Belarus
+376 = Andorra
+377 = Monaco
+378 = San Marino
+379 = Vatican City (assigned but not yet in service; use +39 06 698)
+380 = Ukraine
+381 = Serbia
+382 = Montenegro
+385 = Croatia
+386 = Slovenia
+387 = Bosnia and Herzegovina
+388 = (was pan-European numbers, now unused)
+389 = Republic of Macedonia
(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 +40 (dialed as 00 40 from many places) is Romania. Note that you must omit the trunk prefix 0 from the Romanian number when dialing internationally.
Mobile numbers begin with +40 7.
Landline numbers begin with +40 2 or +40 3.
(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.)
+4 (dialed from many countries as 00 4 or 011 4) is not a complete country code. There are many countries with codes beginning +4. There are several +4X and +4XX codes in Europe.
+40 = Romania
+41 = Switzerland
+420 = Czech Republic
+421 = Slovakia
+423 = Liechtenstein
+43 = Austria
+44 = United Kingdom
+45 = Denmark
+46 = Sweden
+47 = Norway
+48 = Poland
+49 = Germany
(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.)
Leichtenstein is telephone country code +423.
Telephone country code +221 is Senegal, in western Africa, but there are no valid telephone numbers beginning with +221 4.
where is telephone country code 1816
That is not a country code.
The telephone country code for France is +33. The area code for the southeastern quadrant of the country, including the island of Corsica, is 04, or +33 4 in international format.
The telephone country code for France is +33. The area code for Corsica is 04, or +33 4 in international format. The local number is a further 8 digits.
There is no 909 country code.
There is no telephone country code +897, nor +89, nor any other country code beginning with +89. There are no valid telephone numbers beginning with +89.
Gibraltar is country code +350.
Moldova is country code +373.
Slovenia is country code +386.
Togo is country code +228.