I think 4 months for a (presumably) first-time non-violent offence might be pushing it a bit, although a bit more of a slap on the wrists was definitely called for.
More interesting to me was judges comments about airlines needing to consider confiscating all mobiles on boarding in future... my Pogo has a mode specifically for aircraft use, whereby the TX/RX component is completely powered-down, but the unit is still usable for playing games.
This is something we'll see more often as we get increasingly-sophisticated combined phone/browser/camera/gameboy devices - cabin crew can't be expected to know how to verify each and every device is in 'safe mode', and we need some policy to handle this. Tantrums and tears ahead...
R1