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GSM remote anti-theft SMS asks for money

I installed a phone in China Unicom, and the number seems to be 18 yuan for one month, and then I sent a text message on the number of the installed GSM remote alarm device with another mobile phone. The message sent by a car seems to be 0. 1 yuan, and it seems to be 0. 1 yuan, which is the point-to-point SMS fee.