To Dial Luxembourg, you should start with dialing the LU international code +352 then the appropriate area code and the local number.

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How to dial Luxembourg
Example phone dialings for Luxembourg
NationalInternational
Fixed Line27 12 34 56+352 27 12 34 56
Mobile628 123 456+352 628 123 456
Fixed Line Or Mobile27 12 34 56+352 27 12 34 56
Toll Free800 12 345+352 800 12 345
Premium Rate900 12 345+352 900 12 345
Voip20 20 12 34+352 20 20 12 34