The LG Prada was a feature-phone with a nicer display. If Samsung had released the Prada in 2008, they would have been at zero risk from retaliation by Apple.
The LG Prada was so bad you had to use 2px scrollbars with your thumb to scroll down a list, like a contact list. It was like using Windows XP on earlier touch devices. I don't think making something like the Prada in 2008 would have helped Samsung's case in any way, because it had none of the things that made the iPhone great, none of the features people copied from the iPhone.
The LG Prada was a complete failure, because your old, classic feature phones like those in clamshell form were MORE usable with their keyboards than the Prada and its really bad touchscreen and bad software. I wanted to go back to a regular phone real fast when I made the mistake of buying a Prada. Not quite the same experience that people have when they buy an iPhone.
Feature phone or not (you have to compare it to the original iPhone which wasn't a smartphone either), it looked a lot like the iPhone. Apple didn't invent touch screen phones, they "just" made them popular. It's a big accomplishment, but they didn't create the segment.
The other way around actually since the iPhone came out after it. But yes, if you were sent back in time to 2007 you would notice the similarity. I ran a mobile phone news website at the time, the similarity was definitely talked about (see the Engadget link in my OP).
The original iphone had a clean aluminum casing whereas the prada used generic black plastic casing -- I think people could tell them apart back in 2007. Practically all phones on the market were black. The differences were even bigger if you used either device for more than a minute.
And Apple quickly went to all black... The differences between anything Samsung makes and an iPhone are quite apparent too if you use them for a minute.