Choice of sending and receiving text messages: SMS cat, enterprise communication system or mas...

During this period of time, I studied the problem of sending text messages. I had a lot of choices and read them once. I have learned a lot. I will write down the analysis.

1. SMS MODEM
Put the SIM card in the modem, and connect the modem to the computer's RS232 or USB. In fact, it is designed to be a mobile phone that can only send text messages. Many scammers use this to send winning information. Of course, some companies cannot access the Internet or use this cat. Its biggest benefit is simplicity. The biggest disadvantage is that the source number of the received text message is a mobile phone number, which is like a liar.
At present, the market is generally about 1 thousand yuan. However, it is strange that the vendors charge additional API development packages, which is expensive. Some of them require about 2 thousand pieces, which fully reflects the value of the software.

2. Enterprise communications
China Mobile and China Unicom will launch the Enterprise Information Service. The price is not very expensive. The price of 100 yuan in Shanghai is about 1 cent per month. Fast sending speed.
You can use the web interface provided by Enterprise communications to send text messages or develop your own messages. However, their interfaces are still poorly written. The basic practice is that they will establish a TCP socket to the server and then send and receive data through TCP. The most terrible problem is that you don't know when TCP is disconnected, so you won't be able to send it out. So you need to write anotherProgramAnd continuously checks whether the TCP is disconnected. [It seems that the program is poorly written, and it also brings a lot of job opportunities ]. In addition, it is said that the receipt function will be provided. That is to say, if the SMS is sent to the user's mobile phone, a receipt will be sent to the system. The problem is that the receipt is unstable and is often lost. Think about how to explain this function to the user.
Since the spam message has been sent by many people, mobile has increased the limit. It is said that it is difficult to apply, and mobile will not rely on this money to survive. There are a lot of text message channels that want to move the mouse across the street, all of which are changed to using China Telecom's PHS to send advertisements.

3. MAS
The mobile company is pushing another plug-in called mas, which features a high price. It will send you a server, with a monthly rent of about 3 thousand yuan. The main function is to send and receive text messages and wappush. Added a lot of value-added OA functions, including address book, lottery, and investigation. It is said that thousands of units were sold in Guangdong alone, mainly by Huawei and other companies. After reading the system, Java + Tomcat + hibernate + MySQL is used for free software.

It is still quite complicated. We have helped users study it for a long time.

4. Other channel companies
I can see it on Google. There are many and many. The price is 0.06-0.10 yuan per entry, but it must be prepaid> 500 yuan.
 
Many channel companies make money mainly by sending a large number of advertising text messages, which is relatively cheap. The minimum price is 5 cents, which is exactly the target of mobile attacks, therefore, channel companies generally apply for different channels in many places, but it is still very hard. Therefore, spam is difficult to survive.

Many Channel interfaces are well written, which is much better than mobile interfaces. But it is still difficult to live...

We also made a channel in the test, for internal testing only www.tryws.com, using Shanghai Enterprise communications, the speed is extremely fast. Please forgive me for any instability.