S Secure app is not supported in F23 5G device, which app i should use fo lock and mask apps?

My dialer is very slow and it takes at least 30 secs to dial once I press dial, this is completely frustrating, please resolve the issue

I am facing battery and overheating issue after update, in normal usage it goes on fire that you can not even toch it while being on phone with some one, this is very serious, if i put it in charging then it feels like it is going to burst out due to...

Please let me know if lock app is available in Galaxy M51 or not.

After updating it to oreo it hangs too much..