How to check whether your mobile phone is customized by mobile or Unicom?

Look at the 3G system supported by the mobile phone under the network mode set by the mobile phone, and you can know whether it is Unicom version or mobile version. If it's WCDMA, it's Unicom. If it is TD-SCDMA, it is the mobile version. Or you know the model of your mobile phone, or you can directly search the parameters of your mobile phone on Baidu, or you can learn.