This article lost me the moment he quoted wikipedia to explain responsive design. This is not 8th grade, come up with your own definition if you're such an expert.
The rest of article was downhill too. Claiming the full site looks fine on your iPhone is akin to saying "It works on my machine!".
It's pretty much a waste of time from top to bottom.
Out of curiosity, what cell phone that meets the criteria can you afford? The iPhone 4 seems to go for about $200 used, or "free" if you want to tie it to a cell contract – since you are buying a cell phone, that seems like something you will need anyway. There doesn't seem to be a lot of margin for a lower-cost device there.
The rest of article was downhill too. Claiming the full site looks fine on your iPhone is akin to saying "It works on my machine!".
It's pretty much a waste of time from top to bottom.