I received my new prepaid sim today (ordered online). I have activated it online. My online self-serve account shows that my account is activated. I inserted the sim into my unlocked cellphone but I do not have any network service. I have tried everything suggested on the website. I have reset my network, but still no service. The robot chat system does not recognize my new number and is not helpful. I do not have any other number to ask for a call back appointment. Does anyone know what the problem is?