Is the backup phone a normal mobile phone?

The standby machine is an ordinary mobile phone. The backup machine is also a mobile phone, but its function is not so powerful and its memory is not so sufficient, but it has all the basic functions, such as making phone calls and receiving text messages, chatting online and watching videos. A backup machine is a backup mobile phone. It's a pity that it can only be used as a game machine, photo album machine, alarm clock and so on. Many people have to have two mobile phones for work and other reasons, one for daily use and the other for work. Under normal circumstances, the one with poor performance is considered as a backup machine, but even the backup machine should meet the needs of life, and the performance should not be too tight. In general, the main machine uses high-end machines, and the standby machine uses mid-range machines.