The country code for the UK is +44.
The plus sign means "insert your international access prefix here."
The country code and area code of Aberdeen, United Kingdom is 44, (0)1224.
Dialing from the USA, 00 44 would be UK. 00 is the international access code in USA followed by the country code of UK which is 44.
Australia uses country code +61, dialled as 0061 from the UK.
If the Dubai mobile has international roaming, it can be called by dialing the UAE number, country code +971. If you want to reach that phone by dialing a UK number, you may be able to swap in a UK SIM card.
No one uses that code to dial the UK, which is country code +44, not +55. '00' is a commonly used international access prefix, and +55 is the country code for Brazil.
The country code 0204 is not an official country code but is used as a mobile phone area code in the UK, specifically for the London area. If you're looking for a specific country code for international dialing, it might be helpful to check the correct format, as country codes typically consist of one to three digits. For example, the UK country code is +44.
UK
The UK
That is a mobile number - from the UK. This is distinguished by 44 - the country code for the UK, followed by 7. All the UK's mobile numbers start 07 - but when calling from abroad - you omit the zero
The code for the UK from any country is 44
Country code +44 is the UK, and +44 3 is an all-UK number.
The country code for Poland is +48, and Kraków is city code 12. From the UK, dial 00 48 12.