Yes, almost all Tamagotchi have them to signify death.

Is saving it more Easiler?

I tried to save it on the Keitai before

If you mean the having the previous Tamagotchi save them from death mechanic, I don't think it's on the 2024 V3. You could try pressing the reset button if you have four Grim Gotchis and depending on when the device saved, you may be able to go back to before the fourth one appears.

Woa