Dabai, do you still need to buy a 4g card to buy a new mobile phone?

If you have a mobile phone card after buying a mobile phone, you can change it to a 4G card for free in the business hall. And you can change it into a corresponding small card according to the size of your new mobile phone card. It's free.

If you don't have a mobile phone number, of course you need to buy a card. Generally don't care about the number, you can choose a free number. Then choose the tariff you accept.

Now all new cards are for you to apply for a 4G card. When you apply for a card, the business hall will ask you if you have a 4G mobile phone. You said that if you have one, you will get a 4G card. To achieve 4G Internet access, both mobile phones and cards should support 4G.