If you have lost your SIM or your SIM doesn't work, the easiest thing to do is to head to a Mobilezone store, where you can obtain a new SIM that you can use immediately.
If you lost your SIM before it was activated and wish to port your number from your old provider, you won't be able to use the new SIM card until after the porting date. You can buy a SIM in any Mobilezone store for CHF 59.00. Contact us via Chat to activate the card. You will be notified in advance via SMS and you can check your porting status any time in my Lebara.