We’ve seen a microscope add-on for iOS devices that has 80x magnification. The Super Spy telescope lens for the iPhone 6, iPhone 6 Plus and Samsung Galaxy Note 4 on the other hand has 80x optical zoom. Apparently that’s enough to see people’s faces clearly from up to 100m (approx. 330ft) away.
The telescope comes with a tripod and a compatible lens mount that doubles as a protective case for the phones.
That definitely won’t fit in your pocket. You can order the Super Spy telescope lens from Brando for $220 (USD) each. The store also has more affordable telescopes that have 50x and below optical zoom.