o2: Activating the SIM card is not possible - this may be the result

Before you can make calls with your new SIM card from o2, you must activate it. If the activation does not work, various causes can be responsible. Find out in this practical tip what you can do in this case.

o2: Activating the SIM card is not possible - what to do?

• Make sure you have entered your mobile number correctly on this page.
• In addition, you must enter the SIM card number on this page so that it can be activated. Also make sure that you have entered the correct number.
• If online activation does not work, you can also activate the SIM card free of charge at 0800-6699966. There you must also enter your mobile phone number and the number of the SIM card.
• There may also be a problem with o2 at the moment, which is why you cannot activate the SIM card at the moment. On this page you can check whether other users are currently having problems.
• Or incorrect browser settings cause this error. We therefore recommend that you use a different browser. If the activation works, you should reset the affected browser with the following instructions: Reset Firefox, Reset Google Chrome & Reset Internet Explorer.
• If the activation still does not work, contact o2 customer service.

Find out in the next practical tip how you can have the SIM card exchanged at o2.