Try to minimise the apps and functions you are using at any one time.
In most cases it is normal for your phone to warm up, for example, when you are using multiple high-performing apps, listening to music for an extended time, or when your phone’s charging. The environmental temperature may also cause your phone to warm up.
Your phone meets Nokia’s high testing standards for device safety. Nokia also meets the international standard for safety (IEC 60950-1) and country-specific requirements.
To avoid getting too warm and to protect itself, your phone may automatically slow down, close apps, and, if necessary, switch itself off.