According to your description, first of all, you need to ensure that your mobile phone can support Unicom's network standard (WCDMA/GSM) and network frequency. Otherwise, it may affect your use.

If your current data connection is normal, I suggest you check whether your mobile phone has the function of opening data or traffic.

In addition, you can also try to set your software parameters, or try to reinstall.

Or you can restore your network settings, or try to reset your phone according to the following parameters. Do not rule out the problem of your mobile phone parameters affecting the use:

If you use Unicom's 3G card, you can set it according to the following parameters: APN:3G net；; ; User name and password: empty; Gateway and proxy address:10.0.0.172; Gateway and proxy port number: 80.

If Unicom's 2G card is used, it can be set according to the following parameters: GPRS gateway address:10.0.172; Port number: 9201/80; Connection type: WSP/HTTP；; ; Domain access point: uniwap user name: empty; Password: empty.

If you are in a weak area covered by Unicom signal, it may affect your use. I suggest you call local 100 10 to help you check.

If it is not for the above reasons, I suggest you take your mobile phone and mobile phone card to Unicom's own business hall or mobile phone after-sales center to help you test it.