In the United Kingdom, mobile phone numbers are not linked to a specific area. Numbers are randomly assigned across the country, but all are 10 digits long after the 0 trunk code. Mobiles always begin with "07".
Specifically, at the present time, there are UK mobile numbers in the formats:
074xx xxxxxx
075xx xxxxxx
077xx xxxxxx
078xx xxxxxx
079xx xxxxxx
(076xx xxxxxx is mainly for pagers, with 07624 xxxxxx used for mobiles in the Isle of Man)
If you want a number specifically associated with London, that would have to be a landline number. In this case, the area code is 020 and local numbers are eight digits after that. For example, (020) 7222 1234 is London Transport.
The country code for the UK is 44 and you would omit the first 0 before the area code if calling from outside the UK. Therefore a mobile (cell) phone number being called from outside the UK would look like +44 7xxx xxxxxx
You would dial 0091 (the international code for India) followed by the mobile number. In any country - mobile numbers aren't tied to one particular area - so as long as you dial the country code - you'll be connected.
The country code for Greece is +30. Mobile numbers begin with +30 6.
Country code +43 is Austria. Although mobile numbers begin with +43 6, so do some landline numbers.
For American numbers, prefix with country code +1
Bhutan is country code +975. Mobile numbers begin with +975 17.
That code belongs to numbers located in the Dominican Republic.
The phone prefix 694 is from Greece. It is used for mobile numbers in the country.
Niger is country code +227. Landline numbers begin with +227 20. Fixed wireless numbers begin with +227 21. Mobile numbers begin with +227 9.
It depends on the country you're in. Here in the UK, mobile (and most land-line) numbers consist of 11 digits.
The phone number 07984589405 does not have a specific country code associated with it as it is a mobile phone number. It could potentially belong to any country that uses a similar format for mobile phone numbers, such as 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
Mobile phone numbers stay the same no matter where the phone is. Regardless of where in the world the phone is, it is called as if it were in its "home" country.