Is the 56 IOT card reliable?

IOT card is a kind of traffic card cooperated by three network operators, and it is also very common in the market now. This card is exactly the same as the mobile phone card, but you can't make phone calls and send text messages, you can only use traffic, and basically there is no speed limit throughout. The principle of IOT card is to provide a data network for IOT devices and build a data communication bridge, which is convenient for use, management and maintenance. Most IOT devices use IOT cards.