{"id":10506,"date":"2026-07-31T04:34:08","date_gmt":"2026-07-31T02:34:08","guid":{"rendered":"https:\/\/www.winet.ch\/2026\/07\/wie-funktioniert-schweizer-rufnummernportierung\/"},"modified":"2026-07-31T04:34:08","modified_gmt":"2026-07-31T02:34:08","slug":"wie-funktioniert-schweizer-rufnummernportierung","status":"publish","type":"post","link":"https:\/\/www.winet.ch\/en\/2026\/07\/wie-funktioniert-schweizer-rufnummernportierung\/","title":{"rendered":"How does Swiss number portability work?"},"content":{"rendered":"

A new phone system, using Microsoft Teams as a communication channel, or switching SIP trunk providers shouldn't mean getting a new main number. This is exactly where the question comes in: How does Swiss number portability work?<\/strong> For businesses, this isn't just a matter of formally switching providers. It's about ensuring that customers, suppliers, and employees can reach you at your usual numbers\u2014even during the technical transition.<\/p>\n

The good news: Swiss landline numbers and many mobile numbers can generally be ported to a new provider. The key factors are a properly completed porting request, accurate contract information, and a migration process that takes telephony, routing, and availability into account as a whole. By planning these steps early, you can transfer your existing phone number to a modern cloud PBX, a SIP trunk, or a Microsoft Teams integration without having to notify your business contacts again.<\/p>\n

What Happens During Swiss Number Portability<\/h2>\n

When a phone number is ported, the number itself does not change; rather, the network operator that receives and forwards calls for that number changes. The previous provider releases the number, and the new provider takes it over on the agreed-upon date and activates it on the designated platform.<\/p>\n

In a business setting, this can vary greatly. A single direct extension can be routed to a new workstation. An entire block of numbers, including the main number and extensions, can be transferred to a cloud-based phone system. Or the number can be routed to a SIP trunk, which connects it to a local PBX, a session border controller, or Microsoft Teams.<\/p>\n

The porting process therefore always involves two aspects: the regulatory and organizational transfer of the number and the technical setup of the destination environment. Only when both aspects align will the transition be virtually imperceptible to callers.<\/p>\n

How does Swiss number portability work, step by step?<\/h2>\n

The first step is to determine which numbers are to be ported. In the case of a main number with extensions, it must be clarified whether the entire number block will be ported or only individual phone numbers. Especially with older connections, number blocks, value-added services, fax numbers, or separate lines have often evolved over time. Taking an inventory ensures that important contact numbers are not overlooked.<\/p>\n

The porting request is then created. The new provider submits it to the previous provider and coordinates the transfer. To do this, companies must confirm that they are authorized to use the phone numbers in question. The information must match exactly what is on file with the previous provider. Even minor discrepancies in the company name, legal form, address, or contract holder can result in the request being rejected.<\/p>\n

Typically, the following information is required:<\/p>\n