The icon of one sim is not shown on display. How can I do it?

[Mathew John]

The phone icon of one sim of my Lumia730 has been deleted from display. How can I bring it back?

 

[Harrie-S]

The phone icon of one sim of my Lumia730 has been deleted from display. How can I bring it back?

Go to the app list and pin it again.
Also see http://www.windowsphone.com/en-US/how-to/wp8/connectivity/use-a-dual-sim-phone
For some background info.