Different iPhones have different published memory 4GB, 8GB and 16GB. The touch can have 32GB. My understanding is this is the off-line memory (disk alike).
How much actual fast ram is there in the device available for my Cocoa Application?
Is there a preconfigured virtual amount?
Currently released Apple iOS devices have the following amounts of working memory:
iPhone = 128 MB iPhone 3G = 128 MB iPhone 3GS = 256 MB iPhone 4 = 512 MB iPhone 4S = 512 MB iPhone 5 = 1024 MB iPhone 5S = 1024 MB iPod Touch 1G = 128 MB iPod Touch 2G = 128 MB iPod Touch 3G = 256 MB iPod Touch 4G = 256 MB iPod Touch 5G = 512 MB iPad = 256 MB iPad 2 = 512 MB iPad (3) = 1024 MB iPad (4) = 1024 MB iPad Air = 1024 MB iPad mini (1G) = 512 MB iPad mini (2G) = 1024 MB