I am building a universal app. I ran it in the simulator and have put in specific code to scale the app in my code. In the simulator
system.getinfo("model") -- returns "iPhone4" for the iPhone4 device simulator
On an actual iPhone4 device system.getinfo("model") -- returns "iPhone". As a workaround I have put an extra option in my if statement that checks if it is "iPhone" and display.contentWidth == 640 then I assume the device is an iPhone 4. This works.

Nice, thanks!

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-- iPhone 4 Specific
                
isiPhone4 = false
                
if(system.getInfo("model") == "iPhone" and display.contentWidth == 640)then
    isiPhone4 = true
end