Conversation so far:
what is the weight of an iphone 7
The mass of an iPhone 7 is 138 grams.
does the iphone 7 have a headphone jack
Changes introduced with the iPhone 7 included the removal of the 3.5 mm headphone jack.

Question: what are the downsides
Self-contained rewrite: what are the downsides of the removal of the 3.5 mm headphone jack from the iphone 7