ITU stipulates that mobile phones produced by mobile phone manufacturers must have the function of "emergency call" without installing a mobile phone card. As early as 2002, China issued relevant standards that require mobile phones to have the function of "emergency call". An emergency call is something that can save your life in case of difficulties. When you are trapped in an elevator, in an old forest, or in an emergency, calling 110, 120 or other emergency numbers may save your life. However, in fact, when many people dial 110 with their mobile phones, they find that they cannot get through at all.

Difference between emergency call and ordinary call

In general, mobile phone access to the network must be subject to mutual authentication authentication between the mobile phone card and its own operator network. If no authentication is obtained, the phone can't be reached, except for the emergency call mode of the mobile phone. In the emergency call mode, your phone can use any available network at that time, even if there is no money in your phone. The biggest advantage of this is that if you are in the elevator, you have a mobile GSM card, but there is only Unicom's GSM signal in the elevator. At this time, you can use the Unicom network to dial 110119 without authentication. In addition, the wireless system will have priority access after an emergency call, which can help you get help faster.

Why can't I make an emergency call?

The "emergency call" function of mobile phones has become an international convention. Why can't most mobile phone calls 110, 119 and 120 be dialed? When calling 110, 120 and other emergency calls in some mobile phones, "Only for emergency calls" will be displayed. Only 911 and 112 can be dialed, However, there is a circular voice "Hello, please dial 110 for bandit police, 119 for fire alarm, 120 for emergency center, 122 for traffic accident", and there is no manual service available at all. What's the matter?

According to China's regulations, mobile phones must have the function of "emergency call". In fact, there was an omission in the formulation of this industry standard. Although China's regulations mentioned the need to test mobile phones for "emergency call", they did not clearly stipulate that "mobile phones should be equipped with both international and domestic emergency call numbers". Therefore, major manufacturers only need to set "911" and "112" and other international calls to pass the network access test without additional effort to "localize", which is why so many mobile phones cannot dial 110, 120 and other emergency calls in China.

So before you buy a mobile phone, you'd better pay attention to that your mobile phone can make emergency calls. After all, it is also very important from the perspective of life safety.

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