First, read the English article below.

If you have recently purchased a SIM card, then look on the packaging. Sometimes the PUK card is printed on it.  Look at the box that your SIM card came in, and the PUK code should be there on the box or label. You could also call the retailer you have purchased the phone from if you can’t find this code, and they should be able to assist The PUK code is unique to your SIM card, so you can only get this from your mobile network. Sometimes the network will give you this when you first get the SIM card, but not all networks do this.  If you cannot find it, give your mobile network a call, and customer support will be able to give you the PUK code or generate a new one after you have answered some security questions.  The network provider is going to ask you to prove your identity. Sometimes, this entails providing your date of birth and address. You won’t be able to get the PUK code if you can’t prove that you own the phone. You might be asked for the SIM card code from its packaging too. You can try online to find your PUK code as long as you have an online account through your network provider (most offer this service).  Log in to your mobile phone account on your computer and look for a PUK code section on your account page. Where this appears will vary among network providers. For AT&T Wireless, you log into the AT&T online account. Select “wireless” from the “myAT&T” tab at the top of the page. Select “phone/device.” Select: “Unblock Sim card.” A new page will open that provides your PUK card.  Some prepaid phones also use PUK codes and will provide them to you online if you know the mobile number and the name and date of birth of the account holder.If you don’t already have an online account, it’s usually easy to create one if you have your mobile number and basic information to prove your identity. 

Now, please write a short abstract for it in Vietnamese. Abstract:
Kiểm tra bao bì thẻ SIM. Gọi cho nhà mạng. Kiểm tra trên trang trực tuyến của nhà mạng.