I don't think these choices of bins make sense. Here are some sizes of common/popular/major phones:

iPhone (Non-Retina)     320     480     
iPhone 4                640     960         30%~
iPhone 5                640     1136        30%~
Galaxy S3               720     1280        10%
Nexus  4                768     1280
Nexus  5                1080    1920
HTC One                 1080    1920
LG G2                   1080    1920
iPad (Non-Retina)       768     1024                  
iPad (Retina)           1536    2048
Lumina Series           480     800
Lumina Series           768     1280
Lumina Series           1080    1920


It looks like the sizes we should target are: 320 (iPhone, Shitty Phones), 640 (iPhone Retina), 768 (720p and iPad 2), 1080 (1024px and 1080p Phones), 1536 (iPad Retina), then 2048 (Who knows), and 4000 (Max).