Whats your Mobile OS?

Which OS does your Mobile phone use?
For ex. Nokia use Symbian
SAmsung and HTC use Android
Sony Ericcson use Android
Blackberry use Blackberry OS
Palm uses webOS
Iphone uses iOS

I use Samsung galaxy s2 with Android 3.0 honeycomb
wats abt yours?

i currently using 3 smart phone. 1 iphone and 2 blackberry. i love blackberry which OS support Blackberry Messenger. Use it for chatting and business. Iphone only use for listen music and play game except call/sms

Blackbery Bold 9000 , Blackberry torch : OS Blackberry OS 5
Iphone 4 : iOS (don't know have any version)