The dialling code for the London area is01.

伦敦地区的电话区号是01。

The dialling code for central London is0171.

伦敦的拨号代码是0171。

Which Numbers will it pick as its international dialling code?

它将选择哪一个号码作为国际拨号代码？

Callers dialling the wrong area code will not get through.

打电话的人拨错区号时电话就接不通。