Creebies is Nokia's weirdest first party game so far, a sort of cross between (fluff)Friends, Tamagotchi and Animal Crossing. You have to take care of a "Creebi", a small cute monster whose personality and appearance are determined by virtual genes. Amongst other things you decorate its living space, interact with other Creebies in minigames over the internet and through Bluetooth, and even breed new Creebies which take virtual genes from their parents.

Dogz combines a cute 3D puppy simulation with a series of arcade mini-games.
A sort of cross between Elite and Wing Commander, this is a space simulator featuring battles, trading and a plot.

Hooked On: Creatures of the Deep is a 3D fishing title which combines sports, simulation and even role playing to create a detailed game world set across four real life resorts in Costa Rica, Alaska, Scotland and Thailand. Freeform gameplay, quests and tournaments are all available.
As the name suggests, this is a 3D pool simulator. Playing against various barflies in various bars, you can view the pool table from any angle or position, and play with UK or US rules.

The Sims 2 Pets for N-Gage is a 3D pet simulator that concentrates on taking care of a puppy from a choice of five breeds: Chihuahua, Labrador, Mutt (mongrel), Pug and Whippet. There's also an unlockable robot dog if you want to make things more surreal.
The Sims 3 for N-Gage will presumably be a more phone-friendly version of the popular electronic dolls' house simulator.
Spore Origins is the mobile spin-off of the PC game Spore, a simulation of a new life form.