What to do when phone gets too hot.
All electrical products make heat when they are operating. Electrical component uses current to operate and heat occurs for this reason.
The phone may be heated due to,
1. Use of some functions that consume a lot of current.
2. H/W defect in the mobile phone.
Refer to this article when phone gets too hot.
It is normal phenomenon that heat is generated for use of electrical goods. Hence, Samsung always test and check for temperature during operations.
However, if phone gets hot when no functions were used, then you need to send in mobile phone for a repair.
Please contact the nearest Samsung Service Center.