I was able to surf the Internet with WIFI a few days ago, but I don't know why I can't use it these two days. I looked at the wireless driver, and the digital certificate became unsigned, as shown in the figure. Dear telecom users, hello!

According to your description, please download and install the wireless network card driver again. You can use the wired broadband connection and download driver wizard to find the driver you need. I hope it helps you.

If you need to buy telecom mobile phones, you can log in to Anhui Telecom Tianyi Store (/shop/), and many new mobile phones such as iPhone 5, Xiaomi, Samsung and HTC can be purchased at preferential prices, and the contract plan is given away at a premium.

If the above information can't solve your problem, you can also log in to Anhui Telecom Tianyi Store (/shop/) and ask online customer service for help.