How can I reset my password or change my username? Sumaira Ahmad 21 August 2019 08:19 Updated You can change both of these at 123mobile.ch under “My account”. Related articles How do I delete my account? I’m seeing the message “Invalid login credentials” when I try to log in – what can I do? My product is faulty, what can I do? Where can I find my bills and receipts? How can I unsubscribe from your newsletter?