Originally Posted by
LIH Prem
Do not delete or change anything, download and try the gmail ios app, see if you like it.
If you like your existing mail app, you can keep it.
(snip)
... you can replace the icon on your device, but don't delete the default mail app or delete any mail account settings from it.
-David
I haven't found a way to delete the pre-installed iOS mail app, but I'm not jailbroken. Is that even possible?