Although UPC customers make calls on the Sunrise network, they are on the UPC virtual mobile network and therefore have no access to SBB FreeSurf from Sunrise. Unfortunately, this will remain the case for the foreseeable future. An alternative is to switch (while retaining your number) to a Sunrise mobile subscription, which will give you unrestricted use of SBB FreeSurf. If you have any further questions, please contact Sunrise directly: 0800 707 707.