If you have lost your SIM or it has been stolen, you should first try to call your mobile phone. If nobody answers, you should block your SIM, which you can do very easily with our chat service or by calling our hotline.

Monday to Friday: 8:00 a.m. to 10:00 p.m.
Saturday and Sunday: 10.00 a.m. to 7.00 p.m.

From Switzerland, call 0900 480 000 (CHF 1.50/call)
From outside Switzerland, call +41 (0) 44 525 01 21

If you need a new SIM right away, you can buy one at Interdiscount or Mobilezone and have your number ported.