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Hi, I have a new SIM card that I want to activate but unfortunately do not know the phone number. How can I find this out ?

Note: I received the SIM card from my employer and the person in charge left. There is no way for us to know what kind of SIM cards these were (pre-paid or not). I do have the PUK and SIM card number.

Please help. 

Hi @AlexVV, what mystery! 
If your employer has a subscription they should have information about this as well, the number will be mentioned on invoices and other e-mails. If they're under a business subscription you might want to contact our customer service for businesses on 0800-0403

If it's a prepaid you won't need to activate it, it will be activated by making a phonecall