After receiving the message, the sender is 12 1236500. How do I know where it was sent?

When you receive a short message, the specific method to determine where it is sent is as follows:

You can install the mobile phone security manager to check the sender's information.

You can check the attribution of this mobile phone number from Baidu or 00cha.com.

If your mobile phone is a non-smart phone and you don't have a computer, you can call the operator's customer service.

For mobile phones, it is the middle four digits that determine the attribution of mobile phone numbers.

CC+MAC+H0 H 1 H2 H3+ABCD where:

This is a country code. China uses 86.

MAC: it is a mobile access code, and China Mobile has 134, 135, 136, 137, 138, 139, 150. 187, 188, etc. , China Unicom has 13 1, 132, 155, 156,182,65438. China Telecom has 133, 153, 180, 189, etc.

H0h 1H2H3: HLR identification code, which is uniformly distributed by operators. H0H 1H2 is uniformly distributed to provinces by operators, and H3 is distributed to local networks by provinces. So this part determines the attribution of the mobile phone number.

ABCD: Mobile subscriber number, which is assigned by each HLR.

For the service number, it belongs to a special number and needs to be queried through the yellow pages.

Other special segment numbers are:

17, long-distance telephone services, such as 170 domestic automatic long-distance telephone inquiry desk, 173 domestic vertical long-distance semi-automatic registration desk, 176 domestic long-distance semi-automatic inquiry desk, 177 domestic semi-automatic monitoring desk, 179IP voice service access.

18, some service desks, such as 180 postal service, 184 postal code query access code, 185 national post office telephone information service access code, 186 mobile service center, 188 fixed telephone payment desk,/kloc.

19, paging access, 19 1 Unicom radio manual paging access code, 192 Unicom radio automatic paging access code and so on.

20, 30, calling card service.

400 and 800 are used as collect calls.

9, generally used as a special service number.

In addition, the numbers starting with 8 and 9 are also used as telecom and civil service numbers.