Q:

Are cartoon phone wallpapers allowed in islam? i want to change my phone wallpaper into a cartoon wallpaper

A:

It all depends on the theme or message conveyed through the cartoon. If the message is sublime and ethical, you can go for it; it is obscene or unethical, then you ought to avoid it.

We are accountable for the things we project or represent, or communicate.

Almighty Allah knows best.