Luxembourg is +352
A local writes 621 123 456 — the dialer below turns that into what you press.
Luxembourg numbers travel intact: the 621, 661 or 691 mobile code and its six digits follow +352 exactly as dialed at home, since the plan has no trunk zero. The leading 6 is never omitted from abroad, and each mobile even has a sibling voicemail number on a 6x8 code. Dial 00 to leave.
Mobiles are a 6x1 network code plus six digits, nine in total; there is no trunk prefix to drop.
You dial
011 352 621123456
011 exits United States · 352 reaches Luxembourg. From any mobile, +352 621123456 works worldwide.
Type the number the way a local writes it — the arithmetic is derived from each country's ITU plan.
Plan facts verified against ITU-T E.164 assigned country codes · Telephone numbers in Luxembourg — Wikipedia. Prose is our own.
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