Can you elaborate on this? Because I'm thinking of the amount of garbage I put in the bin over a period of two whole years, and the size of my phone, its packaging, chargers, cables, and manuals all together is just not even comparable. Even if you add in the environmental cost of the manufacturing I can't imagine it's even a drop in the bucket compared to other waste.
I'm sure it is a good idea to optimize for waste in some respect, but cell phones seem like they must contribute such a minuscule relative amount so as to be safely ignored for now.