Mobile TD is very slow, Unicom W has not been sold yet, and telecom EV is the best.
Network card We only have big names like Huawei and ZTE in the telecom lobby here, but there is no Dlink. Dlink has been a wired network card for many years and has never heard of CDMA. I hope you didn't buy a fake EV network card, but now you use an old CDMA card to impersonate EV. Formal business halls don't do this, and social agents can't say.
For network problems, please call 10000. You can ask Telecom to send technicians to test the quality of the confirmation signal, or take it to the telecom company to see how fast your Dlink card is in Telecom. If it's still so slow, it's the card problem.