Where the problem comes from?

Users questions: 16:30 China Unicom mobile phone users text messages to mobile phone users in the distribution, the strange thing is mobile phone users was received until 18:45 hours, (mobile phone users have turned off, 17:45 separate machine) which the company is a problem? Ago also appeared every 30 minutes received a text message with the situation, such as In an emergency matter at stake, who bear the responsibility?
Experts answer: Internet text messaging each other frequently the case, which involves both servers, problems are likely to either party, the party not say specifically what. SMS forwarding service requires server processing, server busy or down, the net will happen
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