Legal notice

Open Line explains how calls work today, from VoIP apps to eSIMs and EU roaming. Here is who stands behind those guides and the rules they follow.

Hosting

Every page of Open Line reaches you through Cloudflare, Inc., 101 Townsend Street, San Francisco, CA 94107, USA.

Publisher

Open Line is edited by HSTART, publication director Axel Hars. HSTART is a simplified joint-stock company (SASU) with share capital of €1,599,893 and a registered office at 66 avenue des Champs-Élysées, 75008 Paris, France; Paris Trade and Companies Register (RCS) number 853 093 714, VAT number FR77853093714.

Open Line is not an operator

We sell no calling service, SIM card, top-up or price plan, hold no customer account and take no payment for recommending a provider. Prices, coverage and emergency-call support depend on your operator and country: their terms prevail over anything written here.

How claims are checked

Rules and figures are traced to a primary source: EU regulations on EUR-Lex, regulators such as the European Commission, BEREC, the FCC and Ofcom, IETF and ITU standards, or the platform's own documentation. Data-usage calculations show their working, and each guide displays the date of its last update.

Names and images

Product and network names are used only to describe how they work and belong to their owners. Photographs are credited, with their licences, on the photo credits page.

Not VikingTalk

Open Line is an independent publication, unaffiliated with the VikingTalk calling service that used this domain in the early 2010s or with the blog that followed it.

Contact

Corrections are handled through the contact page.