Why does my iphone 5s display iphone 5s(4G) in space?

First, look at what version of your mobile phone is. Mobile phone version. Unicom edition

Telecom edition

The back cover is a 1526.

a 15xx

Yes . And your mobile phone card. If it is a mobile card.

The mobile phone is a mobile version. You drove 4 g.

You can use the 4g network directly, provided that it is covered by the 4g network. Some buildings and suburbs are not covered, and only E can be displayed.

This is normal.

If the mobile card uses Unicom's mobile phone, you need to jailbreak and install a crack patch to use mobile 4g.