All of Northern Ireland is UK area code 028, which becomes +44 28 from outside the UK. The remainder of the number is always 8 digits. Belfast numbers are usually either 90xx xxxx or 95xx xxxx.
As a special shortcut code, callers in the Republic of Ireland can dial Northern Ireland by substituting the code 048 for 00 44 28.
Mobiles in Northern Ireland use the same codes as mobiles in the rest of the UK. Numbers begin with +44 74 through +44 79.
(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.)
0035321 + the local number
All of Northern Ireland has the same area code: 028. If dialling from outside the UK, use country code +44. For example, 028 9018 0123 becomes +44 28 9018 0123.
Donegal is in the Republic of Ireland, not Northern Ireland. Its area codes are 071 and 074.
Kilcar in County Donegal, Ireland, is in area code 074, which is +353 74 in international format.
To ring a landline in Northern Ireland from the Republic of Ireland, replace the area code 028 with the special shortcut code 048. More generally, to ring any number in the UK, including a Northern Irish mobile, from the Republic of Ireland, replace the leading 0 of the UK number with 00 44.
Country codes never begin with zero, and there is neither a country code +28 nor any country code +280 through +289. In the UK, 028 is the domestic area code for all of Northern Ireland.
The telephone area code for Dunshaughlin in County Meath, Ireland, is 01. This code is part of the Dublin metropolitan area, and it covers various towns and suburbs in the region. When dialing from outside Ireland, you would need to use the country code +353 followed by the area code and the local number.
The Turkish Republic of Northern Cyprus is a self-declared state, recognized only by Turkey. It uses Turkey's telephone country code +90, with the telephone area code +90 392.
The three-letter country code for passports issued by the Republic of Ireland is IRL.
Replace the trunk prefix 0 of the Irish domestic telephone number (mobile or landline) with telephone country code +353 (calling on a mobile) or 00 353 (calling on a landline). These instructions apply for all parts of the UK, even including local calls from Northern Ireland to places just over the border in the Republic of Ireland. Calls from anywhere in the UK to Northern Ireland just dial the UK domestic number. The area code for landlines in Northern Ireland is 028, with an 8-digit local number; mobiles from Northern Ireland use the same mobile prefixes as mobiles from the rest of the UK.
Rowley Regis is in area code 0121, the same as Birmingham. To call from Ireland, dial: 00 = international access prefix from Ireland 44 = country code for UK 121 = UK area code, dropping the leading 0 (7-digit subscriber number)
Ireland is country code +353. From the US, dial 011 353, and then the Irish domestic number without the leading zero.(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.)