What is 0777 in UK?

In the UK, the phone number format for landlines and mobile phones begins with a three-digit area code, followed by a phone number that may consist of up to seven digits. The area codes for the UK are as follows:

01 - London

02 - Republic of Ireland

03 - Northern Ireland

04 - Wales

05 - Northern England

06 - Scotland and Shetland Islands

07 - Other locations in the UK, including mobile phone numbers

Therefore, if a phone number starts with 07, it generally indicates a mobile phone number in the United Kingdom.