It is confusing to write an international dialing code including your international access prefix, because different countries use a variety of different prefixes.
If your international access prefix is 00 (the most commonly used), then you're asking about country code +1 (North America, including USA, Canada, and various islands), area code +1 618 (southern Illinois, USA, including East Saint Louis).
If your international access prefix is 001, then you're asking about country code +61 (Australia), area code +61 8 (Southern Australia, Western Australia, and Northern Territory).
(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.)
Luton's dialling code is 01582.
567218 is not a dialling code from the UK, which all start with zero. The dialling code for Glasgow, Scotland is 0141.
The international dialling code for mainline China is +86
0141 is Glasgow's dialling code. 952 is not a dialling code in any part of the UK.
The dialling code from UK to Australia is 00 61.
+51
001
Portugal
The international dialling code for Germany is 49 So, if phoning from the UK, dial 0049
Dialling code for Switzerland is +41
In the UK, 01709 is the area code for Rotherham.
No. The International Dialling Code for the UK is 0044.