These worked for me:
older iPhones, Lumias, etc:
addSize([320, 400], [[300, 250], [300, 300]]).
newer iPhones, bigger smartphones, smaller tablets:
addSize([340, 600], [[336, 280], [300, 250], [300, 300]]).
iPad & bigger tablets portrait: addSize([768, 200], [728, 90]):
bigger tablets...