I think there is a difference between "popular opinion" and user behavior. User behavior can be driven by many things such as marketing (FOMO- phones are marketed way more than PCs) purchase incentives from carriers or retailers, lifestyle/income changes, upgrading to pass on the phone to a relative, etc.Actually not. I think the way you do it, changing phones relatively frequently, is the popular opinion. For the most part, it's been mine . . .
According to sellcell, global average replacement cycle was 3.5 years in 2025, and 2.4 years in 2013 (numbers in the US skew marginally higher). Replacement cycle overall is trending longer and is relatively comparable between iphone and android.
The most telling trend is those with means upgrade faster (at least in India where this data was from) premium smartphones were 2-2.3 years and entry level phones were 3.5-5 years. I would imagine this would hold true in other countries.