iPhone SOS and what it means when your carrier info disappears

T-Mobile suffered a major outage across parts of the United States last night, impacting voice, data, and messaging services. For iPhone users in particular, this outage meant that the “SOS” icon was displayed in the status bar. Here’s what that means and how to fix it if you’re still stuck in SOS mode. T-Mobile’s major network outage The T-Mobile outage appears to be largely resolved.
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