Of course, 5g mobile phones can use 4g network and wifi, just like the 4g mobile phones we use now sometimes change into 3g or 2g networks because of poor signal. Upcoming 5g phones can also use several of the following. However, Unicom has begun to cancel the 2g network, like 1g and 2g in the future can only be said to be of little use, it is normal to cancel, you can change the base station to 5g base station, so that the 5g penetration rate will accelerate a lot. As for wifi, the speed of the wheel network, the speed of the 5g network is double digits has exceeded the current wifi network speed, unless it is used in the case of some mobile phone signal is not good or less traffic!
Mobile phone card, and your wifi has nothing to do with it, data is data flow, wifi is pig wifi flow
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As long as you apply for a 4G card, you can use a 5G phone as a 4G phone. Normal even WiFi is OK.