To call a Chinese phone number from the United States, dial the international prefix 00, followed by China's country code 86, then the area code (without the leading 0), and finally the subscriber number. For example, to call Beijing (area code 10) number 12345678, you'd dial 00-86-10-12345678. Be aware of potential international calling rates from your provider.

The country code for China is +86. This code is required when dialing a Chinese phone number from any country outside of China. Always include the plus sign (+) before the country code for proper dialing.

China uses area codes to identify different geographic regions within the country. These codes route calls to the correct local networks. Area codes can be 2-4 digits long, with major cities like Beijing (10) and Guangzhou (20) having shorter codes.

Use China's international prefix (00) when making calls from China to any other country. The international prefix signals that the following digits represent a country code and subsequently a foreign number. It must precede the country code you're dialing.

Chinese mobile numbers have a consistent 11-digit format, represented as 1XX-XXXX-XXXX. The initial '1' followed by a two-digit prefix identifies the mobile carrier, while the remaining eight digits are the subscriber's unique number.

The Ministry of Industry and Information Technology (MIIT) is China's primary regulator for telecommunications. They oversee number allocation, policy development, regulatory compliance, and fraud prevention within the telecom sector. MIIT ensures the effective operation and development of the country's communication infrastructure.

You can validate Chinese phone numbers using regular expressions (regex). For example, to validate a Beijing landline, use the regex '^10\d{8}$'. Other regex patterns are available for different number formats like mobile, toll-free, and premium-rate numbers, allowing developers to easily check the validity of user inputs.

Mobile Number Portability (MNP) in China, implemented nationwide in November 2019, lets users switch carriers while keeping their existing mobile number. This promotes competition between operators, leading to better service and pricing for consumers.

China's main emergency numbers are 110 for police, 119 for fire brigade, 120 for ambulance, and 122 for traffic accidents. In Beijing, 999 also serves as a privately operated ambulance number. These services are available in both Mandarin Chinese and English.

To call a number within the same area code in China, simply dial the subscriber's number directly, without the area code or any prefixes. For instance, within Beijing, dial only the 8-digit subscriber number. This simplifies local calling within a designated area.

Each major telecom operator in China uses specific prefixes for their mobile numbers: China Mobile uses 134-139, 147, 150-152, 157-159, 178, 182-184, 187-188, and 198; China Unicom uses 130-132, 145, 155-156, 166, 171, 175-176, 185-186; and China Telecom uses 133, 153, 173, 177, 180-181, 189, 191 and 199. While helpful, remember number portability allows users to switch providers while retaining their original number.

Number allocation in China is managed by the Ministry of Industry and Information Technology (MIIT). Telecom operators request number blocks from MIIT based on projected needs. MIIT evaluates these requests and allocates blocks to ensure efficient use and avoid hoarding, considering factors like market demand and geographic distribution.