What is the impact of Unicom's 3g card access code error?

You may be talking about the access point of the network. If the network access point is set incorrectly, you may not be able to use Unicom's 3G network or even access the Internet. So I suggest you make an accurate network access point. Unicom's 3G mobile phone parameters are set as: APN access point: 3gwap (regardless of case), user name and password are empty, and gateway/agent address: 10.0. 172.