If you have lost your mobile phone 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: 9:00 a.m. to 8:00 p.m.
Saturday and Sunday: 10.00 a.m. to 7.00 p.m.

From Switzerland, call 0900 00 44 88 (CHF 1.50/call)
From outside Switzerland, call +41 (0) 44 525 01 20

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