Never paid more than £10 for a phone.
I have enough friends and wasteful neighbours that I've been able to progress from a base model LG (£10 Sainsbury's) to a Samsung Galaxy S4, within 8 years via top of the range Nokia and Blackberry and iPhones 4 and 4S.
Two of the phones have been salvaged from the rubbish and others were gifts from a friend when she upgraded. Galaxy was the only one that seemed to need a new battery (£7) but, like the Apple S4 before it, was unlocked. So I could switch my PAYG from EE to Three and actually afford to make phone calls !
I suspect that like Car/Dix I will find the gravy train has left the station as more people buy unlocked phones and switch away from providers who bribed them with new models every 24 months.