Send me a text message saying that my Unicom card can use 4g network. But I can't use it. The mobile phone supports 4G. Why?

Unicom's 2G/3G users can use Unicom's 4G network normally only if they meet the following conditions:

1. Need to switch the machine again;

2. The local area needs the normal coverage of our 4G network;

3. You need to use a mobile phone that supports the 4G network and has turned on the 4G network function;

4. The required mobile phone card is already a USIM card (you can check whether "USIM" is printed on the back of the mobile phone card; If it is a "SIM" card, it needs to be replaced with a "USIM" card, and then use the 4G network);

If it cannot be used if the above conditions are met, please replace the machine card for testing.