From 1 December 2026, the cost-control rules for mobile data services while roaming (i.e. when connected to a mobile network other than Swisscom) will change.

The CERN mobile phone subscriptions terms and conditions remain unchanged.

What is changing?

Data roaming limits:

• The conditions for “Restricted” subscriptions are unchanged as these subscriptions do not include data roaming.
• For “Standard” subscriptions, data roaming is limited to 10 GB per month* in the Neighbours zone (included), plus 2 GB in the Neighbours or Europe zone (charged at CHF 5/GB).
• For “Europe” subscriptions, data roaming will be blocked after 40 GB per month* have been used in the Europe zone (including the Neighbours zone).

Data roaming outside Europe:

Subscription owners need to define a maximum monthly* spending limit for data roaming outside Europe (limited to CHF 100) via Swisscom’s cockpit.**

When travelling outside Europe, subscription owners need to purchase a data package via Swisscom’s cockpit**, selecting the destination country and the required data volume.

Voice calls while roaming:

There are no changes. You do not need to buy voice packages.

* Calendar month

** Note: The limit set in Swisscom’s cockpit can be modified at any time, even after arriving at your destination.

Why are these changes being introduced?

Swisscom’s cockpit, a tool for managing mobile usage and the associated costs, was initially developed for private customers and did not fully reflect the requirements of business subscriptions. Swisscom recently updated the cockpit, and new rules now apply.

What does this mean for you?

Assess your monthly data roaming needs and, if necessary, adapt your subscription in agreement with your supervisor:

• If you have a “Standard” subscription and require more than 10 GB per month in France for professional reasons, or frequently travel within Europe, switch to a “Europe” subscription.
• Open Swisscom’s cockpit and define your limits for data roaming outside Europe.
• Purchase a data package when travelling outside Europe via Swisscom’s cockpit.
• If you consider that CHF 100/month for data roaming is not enough, open a SNOW ticket.

Recommendations

Remember that you can also enable SPAM filtering via Swisscom’s cockpit for your CERN mobile subscription.

Buy a local SIM/eSIM and use CERNphone when travelling outside Europe. This purchase is covered by your daily travel allowance, in accordance with Administrative Circular No. 33, point 49.