You CAN do landscape photography with iPhone
I wrote an article Why digital cameras will die and this post is another reason why I believe in it. Sure, DSLR has outstanding quality compared to iPhone or another mobile phone, but anyway - I found that I have a lot of landscape photos in my iPhone and I think that it's not so bad at all...
Check it out - this is a first selection of my landscape photography taken with iPhone 4S and iPhone 5.