Originally Posted by
AndyF1069
About Cell
1. He's never shown in Hell in the Manga, only the anime. There is no indication that he is in Hell at all
2. Cell came from a different timeline. It hasn't been established but it's possible he is in a different Hell than the one that exists of our timeline
3. It is canon that bad souls go to hell to have the evil cleansed from their souls before being reincarnated. The reason Frieza is still in hell is stated either during the movie or anime (I forget which) - that he was too stubborn to accept the process and therefore hasn't been reincarnated.
But most importantly
4. Frieza is far beyond Cell in terms of power now. Cell is smart but since killing isn't allowed, his regenerative properties aren't useful. He offers nothing that Frieza doesn't offer on a far grander scale. Besides, there's clearly a story developing with Frieza. He's plotting. What would Cell's story be? He can't compete with any of the Earth Warriors now. Chances are that even Piccolo could best him. Frieza can put up a fight against both Goku and Frieza (especially as he has mastered the stamina drain of his golden form) and if he gets rid of the gods then Beerus isn't a problem. If Cell were in the same position, what chance does he stand?