China Unicom has many services, and each province launches different services. For example, Anhui Unicom users need to apply for the mobile phone signature service. The mobile phone signature service is for Anhui China Unicom Xuanling users, and the tariff of this service is 5 yuan/month (caller’s signature) or 3 yuan/month (callee’s signature), sending text messages 0.1 yuan/text (Note: No matter when it is activated in the month, the function fee for this month will be charged immediately. Repeated activation/deactivation in the same month will only Billed once), if you need to activate it, you can edit the text message content "qm" and send it to 10660415. Follow the prompts to handle the mobile signature service. For more information, please contact customer service at your home location.