I actually just bought an e71 with symbian. I like it.

The OS on the phone comes with more options than other platforms with about $300 of added apps. Things like SIP stack, syncml client, printing support, doc xls ppt reading and editing, and on and on.

It also supports lots of connectivity beyond the normal bluetooth and wifi, like FM radio and infrared.

Also, symbian is still somewhat of an open ecosystem unlike iphone app store or palm pre app store, etc, which is good to me.

Oh, and windows mobile sucks, android I find too hard to program for and t-mobile here kind of sucks, and iphone hate is philosophical. I used Palm Treos for years, but they are dying off and maybe symbian is too, but that is my best option right now. Maemo is not a phone OS....yet.

I think OP needs an iphone