I had a 1st gen iPhone for 5 years, and currently have a 4s that I've been using for 5-6 years (I only replace my phones when my current one stops working). Th

I had a 1st gen iPhone for 5 years, and currently have a 4s that I've been using for 5-6 years (I only replace my phones when my current one stops working). There's longevity in the devices, but not as much longevity in the software. Each update gets slower than the last and then you stop getting updates at all.