The phone can make calls, send and receive text messages, but cannot connect to the Internet. When I switch to 4G mode, it always displays 3G. What’s going on?

wifi

If you are surfing the Internet via wifi, it is recommended that you click Settings-wlan-Advanced Settings to select Never Sleep, and click Settings-wlan-to find the wifi and click the small arrow on the right , do not save the network, re-enter the password and try again, you can also try restarting the router. If this problem still occurs, it is recommended that you try the wifi network in other environments to see if this problem still occurs.

gprs

If you are using data traffic to access the Internet, it is recommended that you click Settings-Mobile Network-Access Point APN-Reset to default and try again. Data Internet access and the surrounding environment. The weather and location are also related. It is recommended that you try again in another place with a slightly better signal.

The problem of "Cannot connect to the Internet" is very general. I will try to guess the problem you may encounter.

I suggest you try the method and see if it works:

1 It is recommended that you put this mobile phone card into other mobile phones to check whether you can access the Internet.

2 If you cannot access the Internet, please ask your operator whether the phone bill is in arrears

3 If it can be used, please put in your Xiaomi phone and turn on the data traffic switch. And reset the default in Settings-Access Point APN, then restart the phone and try again.

4 If you still cannot access the Internet, it is recommended that you back up your data, enter recovery to clear all data (turn off the phone, hold down the volume up + power button to enter recovery), and upgrade your phone to the latest development version of the system via wire brush. For the time being, Don't install apps that require root permissions and see if you can get back to normal.

WiFi Internet access

You can set up your mobile phone as follows:

1. Click Settings--WLAN and select the network you want to connect to. arrow next to the name, choose not to save the network, and re-enter the password.

2. Restart your mobile phone and router.

3. If it still doesn’t work, it is recommended that you try to see if the wifi in other environments can be used normally.