I'm not sure that's as true as it once was. All the major networks now have significant shop window space dedicated to SIM Only products for people keeping thei

I'm not sure that's as true as it once was. All the major networks now have significant shop window space dedicated to SIM Only products for people keeping their existing phone. There is even a thriving ecosystem of SIM only network resellers - GiffGaff, Lebara, Smarty, 1pmobile, etc. - https://www.three.co.uk/sim https://www.three.co.uk/sim - https://ee.co.uk/mobile/sim-only-deals https://ee.co.uk/mobile/sim-only-deals - https://www.o2.co.uk/shop/sim-cards/sim-only-deals https://www.o2.co.uk/shop/sim-cards/sim-only-deals - https://www.vodafone.co.uk/sim-only https://www.vodafone.co.uk/sim-only There will always be customers who upgrade every 18-24 months, but as flagship phones have become more expensive and the features more evolutionary (e.g. slightly better camera, slightly better screen), I think fewer people see the value than in the past.