Can the old man-machine use Unicom 4g card?

Old people can install 4g cards, but they can't use 4G networks.

1, the card slot of the general old man-machine supports the standard smart card body.

The 2.4G card supports backward compatibility, that is, it supports 4G, 3G and 2G networks.

3. The old man-machine supports the 2G network, so you can put the 4G card on the old man-machine to use voice and SMS functions.