- The BB CPU (Baseband Processor or Baseband Controller) in an iPhone X is responsible for controlling the device's cellular connectivity. If there is a problem with the BB CPU, it can result in issues such as no service, poor call quality, or difficulty connecting to cellular networks. Some other symptoms that can indicate a problem with the BB CPU include:
iPhone X not connecting to cellular networks or showing "Searching"
The device is unable to make or receive calls, send or receive texts, or access the internet
Dropped calls or poor call quality
The device displaying "Invalid SIM" or "No SIM card installed"
The device displaying "No Service" or "Emergency Calls Only"
There are several reasons why the BB CPU could be malfunctioning. It could be a hardware issue caused by physical damage or wear and tear, or it could be a software issue caused by a bug or a failed update. In some cases, the problem may be caused by a corrupted or malfunctioning SIM card.
If your iPhone X is experiencing BB CPU problems, it's recommended to take it to an Apple store or authorized repair center for further assistance. The technician will be able to diagnose the issue and recommend the appropriate course of action, which may include repair or replacement of the device.