how to use my android phone without the bottom control unit

[AC Question]

fly android phone

 

[B. Diddy]

Welcome to Android Central! What do you mean by the bottom control unit? Which phone?

 

[belodion]

If you mean that your screen navigation buttons are not working, you may be interested in Pie Control type apps, and similar, in the Play Store.
If you don't mean that, I'm as baffled as the previous poster.