Are there any good lenses/accessories for my iPhone 5S that'll allow for better optical zoom?
For their price of like $8-40, the Chinese prime and zoom lenses aren't bad.
Probably a good match for a mobile phone camera, overall.
If you need more, just pay up and get a MILC or DSLR.
for one thing a pocket camera is fucking horrible so I assume you're talking about a dslr camera... but Dslr cameras are expensive and bulky so most people just use there phone.
so when it comes down to budget then actually investing in a zoom lens for your phone isnt that bad of a decision
It's an infinitely worse decision than just buying a compact camera.
You've come to us for advice as you obviously don't know shit, stop trying to act like you now know what you are talking about.