Is it illegal to send a text message to the other party and call the other party once, 50 yuan?

If the amount of 50 yuan is defrauded by Internet, it is illegal, but it does not constitute a crime, only public security punishment is required. According to the provisions of the "People's Republic of China (PRC) Public Security Administration Punishment Law", it is generally detained for more than five days and less than ten days, and may be fined up to 500 yuan; If the circumstances are serious, he shall be detained for more than 10 and less than 15, and may also be fined less than 1000 yuan.