How To Call Luxembourg From US: Updated For 2025
Quick Answer
To call Luxembourg from the United States:
- Landline:
011 + 352 + Luxembourgish Number(Luxembourg uses a closed numbering plan; there are no separate area codes after the country code. Numbers are typically 4-6 digits for older fixed lines, or 8 digits for newer fixed lines often starting with 2X. Mobile numbers are 8 digits after the country code). - Mobile:
011 + 352 + Mobile Number (8 digits, e.g., 6X1 XXX XXX)
Examples:
- For a Luxembourg City landline (older style, e.g., 4XXXXX):
011 + 352 + 4XXXXX - For a newer Luxembourg landline (e.g., starting with 26):
011 + 352 + 26 XX XX XX - For a Luxembourg mobile phone (e.g., POST prefix 621):
011 + 352 + 621 XXX XX
Luxembourg is on Central European Time (CET, UTC+1) / Central European Summer Time (CEST, UTC+2). This is generally 6 hours ahead of US Eastern Time (ET).
How to Dial Luxembourg from the US
How to Call a Landline in Luxembourg
To call a Luxembourgish landline from the United States, follow these steps:
- Step 1 – Dial the US exit code: Start by dialing
011. - Step 2 – Dial Luxembourg's country code: Next, key in
352. - Step 3 – Dial the Luxembourgish phone number: Luxembourg uses a closed numbering plan. This means there are no separate area codes to dial after the country code.
- Older fixed-line numbers can be 4 to 6 digits long.
- Newer fixed-line numbers (since May 2000) are 8 digits long and often start with a
2(e.g.,24XXXXXX,26XXXXXX,27XXXXXX). The initial digits after the country code (e.g.,24 53 XX XXfor Esch-Sur-Alzette) function similarly to integrated area/exchange codes.
For example, to call an older 6-digit Luxembourg City number like 456789, you would dial: 011 352 456789.
For a newer 8-digit landline like 26 12 34 56, you dial: 011 352 26123456.
How to Call a Mobile Phone in Luxembourg
Calling a Luxembourgish mobile phone from the US involves these steps:
- Step 1 – Dial the US exit code: Start by dialing
011. - Step 2 – Dial Luxembourg's country code: Next, key in
352. - Step 3 – Dial the Luxembourgish mobile number: Mobile numbers in Luxembourg are typically 9 digits long when dialed domestically (e.g.,
0621 XXX XXX). For international calls, drop the leading0. The number will start with6followed by 8 more digits (e.g.,621 XXX XXXafter the country code).
For example, if the Luxembourgish mobile number is domestically 0621 123 456, you would dial: 011 352 621 123 456 from the US.
Understanding Luxembourgish Phone Numbers
Luxembourg uses the country code +352. It has a closed numbering plan, meaning that after dialing +352, you dial the subscriber's full national number without separate regional area codes. The leading 0 used in domestic dialing is dropped for international calls.
Landline Numbers
- Format from US:
011 + 352 + National Number - National numbers for fixed lines can vary in length:
- Older numbers: 4 to 6 digits (e.g.,
+352 XXXXor+352 XXXXXX). - Newer numbers (since May 2000): 8 digits, often starting with
20,24,26,27,28(e.g.,+352 26XX XXXX). The first few digits of these 8-digit numbers often denote the local exchange or broader area (e.g.,22for Luxembourg City,53for Esch-sur-Alzette).
- Older numbers: 4 to 6 digits (e.g.,
Mobile Numbers
- Format from US:
011 + 352 + 6XX XXX XXX - Mobile numbers in Luxembourg start with
6after the country code and are 8 digits long (e.g.,+352 621 XXX XX).
Luxembourg Numbering Plan (No Separate Area Codes for Dialing)
When calling Luxembourg from the US, after dialing 011 + 352, you dial the subscriber's complete national number. Luxembourg employs a closed numbering system, so distinct regional area codes are not dialed separately as in some other countries. However, the initial digits of a fixed-line number often correspond to a geographic area or specific exchange. For example:
| Initial Digits (after +352) | General Area / Major City Often Associated |
|---|---|
20..., 22..., 24..., 25..., 26..., 27..., 28... | Luxembourg City and surrounding areas (newer 8-digit numbers) |
4X XXXX (e.g., 40-49) | Luxembourg City (older 6-digit numbers) |
5X XXXX (e.g., 51-58) | South (e.g., Esch-sur-Alzette, Dudelange, Differdange) |
7X XXXX (e.g., 72, 75, 79) | East (e.g., Echternach, Grevenmacher, Consdorf) |
8X XXXX (e.g., 80, 81) | North/Central (e.g., Diekirch, Ettelbruck) |
9X XXXX (e.g., 92, 95) | North (e.g., Clervaux, Wiltz) |
(2)3 XXXX XX (older format) | Mondorf-les-Bains/Bascharage/Noerdange/Remich area |
Note: This table provides general guidance as the numbering plan has evolved. Newer fixed-line numbers are 8 digits often starting with 2X. Always confirm the exact number you need to dial.
Luxembourgish Mobile Phone Prefixes
Luxembourgish mobile phone numbers are 8 digits long after the +352 country code and start with the digit 6.
| Operator (Typical Association) | Mobile Prefix (after +352) | Example Format (after +352) |
|---|---|---|
| POST Luxembourg | 621, 628 | e.g., 621 XXX XX |
| Orange Luxembourg | 661, 668 | e.g., 661 XXX XX |
| Tango (Proximus Group) | 691, 698 | e.g., 691 XXX XX |
*Mobile Number Portability is active in Luxembourg, so the prefix does not always guarantee the current service provider. The 'X' represents further digits of the subscriber number.
Time Difference
Luxembourg operates on Central European Time (CET), which is UTC+1 during standard time. During summer, Luxembourg observes Central European Summer Time (CEST), which is UTC+2. This change typically occurs from the last Sunday in March to the last Sunday in October.
The time difference compared to the US East Coast (ET):
- When the US East Coast is on Eastern Daylight Time (EDT, UTC-4) and Luxembourg is on CEST (UTC+2): Luxembourg is 6 hours ahead of ET. (e.g., 12 PM EDT is 6 PM in Luxembourg).
- When the US East Coast is on Eastern Standard Time (EST, UTC-5) and Luxembourg is on CET (UTC+1): Luxembourg is 6 hours ahead of ET. (e.g., 12 PM EST is 6 PM in Luxembourg).
Luxembourg's Phone System
Luxembourg has a highly developed and modern telecommunications infrastructure, regulated by the Institut Luxembourgeois de Régulation (ILR). The country boasts widespread high-speed broadband coverage, with extensive fiber-optic networks (FTTH/FTTP) and advanced mobile services including comprehensive 4G/LTE and rapidly expanding 5G coverage. Key telecom operators include POST Luxembourg (the incumbent), Orange Luxembourg, and Tango (part of the Proximus Group), along with other smaller providers and MVNOs. The system uses a closed national numbering plan, meaning area codes are integrated into the subscriber number and not dialed separately after the country code.
Best Times to Call
Considering Luxembourg is typically 6 hours ahead of US Eastern Time (ET):
- For business calls from the US East Coast, a good window is morning ET. For example, 9 AM - 11 AM ET would correspond to 3 PM - 5 PM in Luxembourg.
- Typical business hours in Luxembourg are Monday to Friday, from around 8:30/9:00 AM to 5:30/6:00 PM CET/CEST.
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