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The Quadlock mounts look nicest, although not that cheap. Or there are a whole variety of crappy options for £5-£10 on Aliexpress.
I've not found anything as hard-wearing and works as well when pissing it down with rain as a Garmin or Wahoo but in theory there should be plenty of apps out there to let you use your phone (although maybe not all in one neat app).
aggi-
Quadlock are nice. Don't mount them directly to the back of a Sony though - use a case.
I have one of their handlebar mounts I'm not using as well as a aerobar mount and some of those profile knob mounts sitting around.
I got a new phone when the Sony died and had to use one of these mounts as I couldn't find a solid plastic one to use with my quadlock. It worked.
https://www.amazon.co.uk/Smartphone-Patented-Universal-Compatible-Motorbikes/dp/B01N4X0HUS/ref=redir_mobile_desktop?_encoding=UTF8&ref_=cm_cr_arp_mb_bdcrb_top -
I bought one of these http://www.chainreactioncycles.com/sram-quickview-garmin-computer-mount-adaptor/rp-prod123354 and after a bit of dremel action epoxied it to a hard case which then mounts to any garmin mount which has worked very well as a possible, low profile option. The bulk of many of otp mounts put me off.
hippy
sidewinder
But I already have an iPhone which is a pretty sophisticated computer, which I would always take on a ride anyway.
With regard to looks, iPhones themselves are pretty slick. If Apple themselves designed the mount it could feasibly look fine.