Can the mobile phone card be upgraded to 4g by SMS?

Mobile card sends SMS to upgrade 4G network: 1. First of all, your mobile phone should support 4G network. It's useless not to support 4G! 2.USIM cards are all small cards. At present, most 4G mobile phones support small cards! 4G mobile phones can use 3G or 2G cards, and 4G USIM cards can also be put into 3G or 2G mobile phones, but none of them can use 4G networks, only 3G or 2G networks can be used. 3. Where there is a 4G signal, there will be the word "4G" on the cell phone signal grid, so that you can enjoy 4G. Where there is no 4G signal, the cell phone signal grid will display 2G or 3G. 4. Old mobile users don't need to register, let alone change their numbers. They still use their original numbers, but remember to bring their ID cards to the business hall. Although it is not registered, it needs to be verified. Unicom card sends SMS to upgrade 4G network;

1. Provided that your mobile phone supports 4G. You can't upgrade without support. After you confirm that you can upgrade, Unicom 3G users can automatically change 3G to 4G by sending a short message with the content of "KT4G" to 100 10.

The call time and Internet traffic in the 2.3G package remain the same, but the only change is the Internet speed, which has changed from 3G to 4G, and the maximum Internet speed has increased several times.

3. Unicom 3G enjoys the 4G network for free. At present, it seems that only Guangdong Unicom has this benefit, and other regions may have to wait.

It should be noted that when you can't use 4G in your area, you will definitely drop to 3G to surf the Internet. If you don't even have 3G, you can surf the Internet automatically with 2G.