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![01 London area code phone number, which was replaced several years ago, still on display on the front on a business in Twickenham. London. UK. (96 Stock Photo - Alamy 01 London area code phone number, which was replaced several years ago, still on display on the front on a business in Twickenham. London. UK. (96 Stock Photo - Alamy](https://c8.alamy.com/comp/MKTXYE/01-london-area-code-phone-number-which-was-replaced-several-years-ago-still-on-display-on-the-front-on-a-business-in-twickenham-london-uk-96-MKTXYE.jpg)