Hello, I bought the Unicom version of Xiaomi 1s, but I often can't get through the phone, saying that I can't get the link, the call can't be forwarded, and the SMS can't be received.

1. Please back up data, enter recovery mode, clear cache, clear user data and clear all data. When restoring the backup, do not restore the settings and third-party security software in the mobile phone. Try to use it normally.

2. If it still doesn't work, I suggest you brush the whole package again with a line brush according to the following method. You can refer to the following brushing tutorial:

A. First, you download a MIUI line brush package suitable for your model in Xiaomi official website. This is the link:/topic-mirom.html.

B. During downloading, please back up data, enter recovery (shutdown, press and hold the volume increase+power on key to enter recovery), and clear the cache, user data and all data. Install the computer driver and download a miflash brush tool. This is the driver installation link:/thread-504332-1-1.html.

C. After everything is ready, please use the six-line brush according to the official website's brushing tutorial, which is the official brushing tutorial:/thread-3104435-1.html.

D. If you are not familiar with brushing, you can refer to the brushing video tutorial made of rice flour:/v _ show/id _ xnteymjq1mzi4.html.

Xiaomi's mobile phone is inseparable from everyone's support. If you have any questions, please feel free to visit Xiaomi Community or Baidu to learn and communicate with Xiaomi.