"Les touches sont trop petites pour mes doigts."

Translation: The buttons are too small for my fingers.

[--Roody--]

According to WordReference, a computer button is either une touche or un bouton. But I think on cellphones, it's more common to say une touche for a button or key.

Off topic, a belly button is un nombril IIRC. :)

https://www.wordreference.com/enfr/button

https://www.wordreference.com/fren/touche

[Geoff_Campbell]

Exactement. Mes doigts sont comme des saucisses !

[johndelaroo]

The keys are too small for my fingers.

[Poef9]

I had that as well and was accepted.