My iPhone Does Not Recognize the SIM without Service: How to Solve It

Method 1: Check network settings and reinsert SIM card Method 2: reset your iPhone's network settings Method 3: Use Tenorshare ReiBoot to fix iOS system errors Conclusion Insert your SIM card into your iPhone, it's recognized correctly... but still, a worrying message appears at the top of the screen: "No service." This can happen especially after a major system update, such as when you upgrade my iPhone to iOS 18/19 and I don't have a signal. T…