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.)
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All landlines in Northern Ireland are in UK area code 028, which is +44 28 in international format.
There is a special shortcut code for calling Northern Ireland landlines from the Republic of Ireland. Instead of dialing the full international prefix, 00 44 28, you can dial 048 followed by the 8-digit local number in Northern Ireland. (Calls in the other direction must be dialed in full international format, even though some calls just across the border are billed at local rates.)
Mobile phones in Northern Ireland use the same codes as mobiles throughout the UK. Numbers begin with 074 through 079, which is +44 74 through +44 79 in international format.
(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.)
028.
+44 28 if dialling from an international number (not from the UK).
The Republic of Ireland allows you to dial either the full international number 00 44 28, or you can dial a special shortcut code, 048, followed by the 8-digit local number.
Northern Ireland is part of the UK, which uses telephone country code +44. All of Northern Ireland is in UK area code 028, which becomes +44 28 in international format. The local number is always 8 digits. Mobile phones in Northern Ireland use the same mobile codes as the rest of the UK, in the range 07400 through 07999, which is +44 7xxx in international format.
To call Northern Ireland from the Republic of Ireland, you can dial the number in full international format, or you can use the special shortcut code 048, which is equivalent to dialing 00 44 28.
(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.)
All of Northern Ireland is in UK telephone area code 028, or +44 28 in international format. Mobiles from Northern Ireland use the same numbering ranges as mobiles from the rest of the UK, with numbers beginning with 074 through 079, or +44 74 through +44 79 in international format.
If you are calling a Northern Ireland landline number from the Republic of Ireland, you can use the special shortcut code 048 in place of UK area code 028, instead of dialing the full international number with 00 44 28.