Can you call London from Paris with landline 003344?

It is not possible to make an international call using a landline number alone. An international access code is required with the country code and area code of the destination. For example, to make a landline call from Paris, France to London, UK, you would dial 00 (international access code), 44 (country code for UK), followed by the area code of the destination (for example, 20 for London), then the local phone number. In this case, the full number you would dial is: 00 44 20 XXXXXXX.