(As the price of mainstream smart phones is lowered, the user base is gradually expanding. Compared with the huge user base, the inability to use complicated operations and functions will become the main obstacle that people will encounter when using smart phones. Have you ever thought of buying a service together with the purchase of smart phones, a service that allows you to play with smart phones? Of course, if this service is free, OK. Based on this concept, 91 mobile assistant)
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