Hi
This page Real-time tools for 3D, AR, and VR development | Products says:
Unity iPhone supports .NET 1.1 while .NET 2.0 and generics are not supported.
Is that still the case? Do I need to set my player back down to 1.1 for my game to work on the iPhone?
(I looked for an answer first, but couldn’t find it.)
TIA
that was true till 1.5 a year ago or so.
since 1.6 .net 2.0 has been supported and now on U3 iphone you have .net 2.0 frameworks +++ (including c# 3 features and stuff like linq)
Thanks for the quick reply! 
(I thought that was the case, but became concerned when I saw the entry on that page. Perhaps someone from the team will read this and correct it.)
Does anyone know: Are there any performance differences between the various .net implementations?