It can be captured; however, it uses “https” for very powerful encryption, so it can’t be read. Of course, the NSA is working on that decryption at Oak Ridge right now. They’ll be saving zillions of message in Utah until they get decryption working.
I just like making it hard for ‘em.
These days, you can't be sure of that.
https://www.grc.com/fingerprints.htm
http://www.zdnet.com/nokia-hijacks-mobile-browser-traffic-decrypts-https-data-7000009655/