The worst mobile operator ever!!!!!!!!!!!!!!!!! It's very difficult to register the sim card. Tell your developers that alternative number should include country code (different from swiss one in some cases) because when you are new in Switzerland you don't have swiss number, so you can put only your old number from another country as an alternative phone number. If you are not smart enough to understand that site accepts only swiss phone numbers you sensitive data will be sent to random person. I don't think it's normal if the guy in call center says you: "I don't understand your English, find someone who can translate for you". I have C1-C2 level by the way.