1, in the first point, it is not about cards, but about people, who sell cards. Some agents are simply herding sheep, promising this and that before selling cards, and guaranteeing this and that. If something goes wrong with the card, it will evaporate instantly. Look for a responsible agent if you want.

On the second point, we are not talking about cards, but about policies. Everyone should know that it is not illegal to put the IOT card on the mobile phone itself, but it is illegal and belongs to a gray area. Any card, even if it is best to use the most stable thing, has the probability of dead cards. Especially the recent card ban, I think the most stable card is also unfortunate. Screenshot to change the card for the card issuer and return to the first point.

3. Tell me about the IOT card company. No card with the lowest stability is required. This card is for internal use of individual companies and is not issued externally. The top stability are Jindouyun, Elephant, Canghai and Zhongze. The difficulty increases from right to left, and the stability increases from right to left. Small company, I don't need to say more, just refer to a treasure and follow Tik Tok to 9 yuan's 100G "God Card".

4, and then say something card. There are many kinds of cards for big companies. Take Canghai as an example: Menglongka and Yaoxingka of Canghai. The magnum card is stable and the virtual quantity is less (less than 5%), which is called zero virtual quantity, but the card is less than the demand. At this time, some agents will take out Yao Xing cards to confuse them, claiming that they are all from the same company. (The amount of Yao Xing's card is less than 30%) Some agents say that they will give the Xinxing card first, and if they have a card, they will exchange it for free.