In the customer center you can see when you can extend your contract.
You can't see the links? If you have bills with expired payment terms, the links will not be displayed: settle your outstanding bills. Likewise, the links will not be displayed, if you can not yet extend your contract.
Swisscom is offering time-limited device deals with subscription renewals.
Calculate the price for your new cell phone with an extended contract:
Your old mobile phone is still worth something. You can donate your mobile phone to a good cause through Mobile Aid or enjoy a credit on your invoice – or as a bank transfer – with Mobile Bonus.