Yes, dialling is a variant spelling of dialing. For example, "What telephone number are you dialling?"
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
STD dialling began in the UK in 1958.
First dial 00 353 56 and then the local number.
+51
By dialling his number
0141 is Glasgow's dialling code. 952 is not a dialling code in any part of the UK.
001
Portugal
The dialling code from UK to Australia is 00 61.
"Real" is the root word of "really".