Buying a mobile phone is a problem that everyone will encounter, especially in such an era of smartphones. Every few years, the smartphone in hand can't keep up with your rhythm, various problems such as stunned, crashed, and unable to play new games will be highlighted.

At this time, we will face a problem: Should we buy a brand new phone or a second-hand phone? Most people will choose the newly listed flagship phone. Some people may not understand it, but some people will choose second-hand mobile phones. In some cases, buying a second-hand mobile phone is a very economical and economical act.

How fast is the upgrade of mobile phone? It is no exaggeration to use

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