T-Mobile experienced a large-scale network outage across the United States, causing a large number of iPhone devices to crash, with the device status bar uniformly showing an "SOS" logo.According to data compiled by Downdetector, T-Mobile's network outage began around 4 p.m. ET. The outage was widespread, with users across the country reporting problems with their services.

On social platforms, thousands of T-Mobile users complained that they were unable to make calls, send text messages or use cellular data on their iPhones.The affected iPhones all display an SOS icon on the status bar, indicating that the device currently has no network connection at all. However, users can still make emergency calls during this period, which is also a basic function that the iPhone will retain once the regular network signal is lost.
In response to this large-scale outage, a T-Mobile spokesperson said that the company's team is actively responding to reports that some customers are affected by technical difficulties. All impacts on services are being resolved and are currently the company's highest priority. The spokesperson said that the company is fully aware of the importance of maintaining communication for users, and all available resources have been focused on resolving this issue as soon as possible.
Information shows that T-Mobile is a multinational mobile phone operator headquartered in Bellevue, Washington, USA, with business covering multiple markets in Europe and the United States. As the third largest wireless operator in the United States, its business covers mobile communications, Internet of Things and satellite network services, with more than 109 million users.
It should be noted that when the user sees the words "SOS" or "Searching" in the status bar of the iPhone or iPad (wireless LAN plus cellular network version), it means that the device is not currently connected to the cellular network and can only be used to make emergency calls. This function is designed to ensure that users can still obtain basic emergency communication guarantees when the signal coverage is outside or the network fails.