How long can the network age upgrade plan be used?

Different types of packages have different network age upgrade schemes. For example, Unicom 3G mobile phone users can apply to join the 3G network era upgrade plan for free. According to the time after you join the network age plan, the system will give a certain amount of online traffic in the province every month. The longer you join, the more you give, and the longest you give is 24 months. If it is a 4G SMS network age upgrade plan, the longer the network age, the more gifts will be given. After success, 50 domestic peer-to-peer SMS messages will be given in the next month, with an increase of 50 messages per month in the first six months and 300 messages per month after the sixth month. It is free to apply for the age upgrade plan of 4G SMS network, and there is no charge for you.

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