The Mobile Data shortcut on some Galaxy S6 and Galaxy S6 Edge have been mysteriously missing on a handful of handsets.
We first received a report from a @theglennong yesterday via Instagram regarding the issue on his Galaxy S6 Edge.

The shortcuts is complete gone and even editing the Quick Settings panel does not show up the shortcut.
This morning, we also experienced the same issue on our openline Galaxy S6.
We can still activate or deactivate mobile data via the Settings -> Data Usage as well as the power confirmation window (long press on the power button). However, shortcut for the Mobile HotSpot is also missing.

We’re still unsure why this happened so we continue to investigate. Please chime in on the comments if you encountered the same problem.
Update: Here are several possible fixes for the bug:
1) Backup your phone’s content and do a full factory Reset.
2) Download and install this temporary fix here (fixdatatoggleapp.apk).
3) Official Samsung app fix here.

FOUND a solution to mobile data shortcut restore
Steps
1. Install ” QUICK PANEL RESTORE” from Samsung app store
2 .Open it & click on restore
Works perfectly well
Try it !
Thanks to Samsung care support