The title says Ice Cream Sandwich. The post says IOS. Which one are you trying to get? Either way, it isn't possible because the phone uses the Symbian OS by Nokia.
If you were to try and get it to run Android or IOS you would more than likely end up with a bricked phone.
The biggest problem you'd have would be having to write your own drivers for all of the phones hardware. Display, storage access & read/write permissions, peripherals (keyboard, buttons, headphone jack), etc etc.
It's really not even worth trying because you would just ruin your phone in the process, to be honest.
If you want an Android phone, I'd recommend the Google Nexus 4 - and if you want IOS, well, go buy an iPhone.