If you hand in your old phone on the spot when purchasing a new smartphone at one of our shops, the buyback value is deducted directly from the sale price of the new device and is guaranteed. If you don’t want to hand over the device right away (due to data backup, etc.), or you’re purchasing a new smartphone via the Swisscom online shop or our hotline, you may send us the old device by post at a later date. In this case, the buyback price is not guaranteed, as the condition of the device might differ from what you have specified. The details you provide will be corrected if needed, and you will receive a new buyback offer by email. The difference will then either be charged or credited to your next monthly invoice.