How do you call from France a 0878 telephone number?

To call a 0878 telephone number from France, you need to dial the international access code (00), followed by the country code for the UK (44), and then the 0878 number without the leading zero. The complete format would be: 00 44 878 followed by the rest of the number. Be aware that calls to 0878 numbers may incur higher charges.