Mobile ID is the common solution of Swiss cellular telephone providers.
Mobile ID is a solution for secure login, statements of intent, and digital signature triggering. With Mobile ID, no additional auxiliary devices are needed, just a cell phone and a Mobile ID-ready SIM card.
At https://www.mobileid.ch/en you can check whether your Mobile ID is already activated. If you do not yet have a Mobile ID, you can order a new SIM card from your provider. A new SIM card with Mobile ID is available free of charge from almost all providers. We recommend all signers to apply for the Mobile ID, but this is not a prerequisite.