You can push to 3/4 years easily nowadays. I had the 12 pro and it was ok, only the battery life sucked and now that I switched to 15 pro I notice a big difference in speed and battery. Also the camera is the one who gets the huge improvements, but I personally don’t care that much about that.

4-5 maybe 2 if you’re wealthy enough or have a Bring-it-back type plan

Xfinity Mobile gave me $830 trade in on my 13 Pro 128 GB. Had no issues and no intent on trading in but for $7 a month for 2 yrs I couldn’t pass the 15 Pro up. Otherwise I was gonna ride that Sierra Blue til the wheels came off

3 years

Well I dont personally sell my old iPhones, so I think 5-6 years is a good amount of time with how much you pay for an iPhone. Some of my older iPhones did not last that long in terms of performance but I think newer models certainly do, no problem

3-4 years for me.

You will notice and enjoy the upgrade after 4 gens. Example: 11 to 15

Until it stops getting new ios updates.

Until I break it. I think I have the 11 and just cracked my screen. But idk I’m still using it.

I have an iPhone 8 still works imagine all the money I’ve saved not buying new ones lol

3 years

Depends on your financial situation, for me personally around 3 years, but 4-5 years is definitely doable with how long Apple provides iOS updates.

For me it’s optimally 4 years Maybe 5 if the battery is fine (with 1 battery replacement around the 2.5 year mark).

But I’m also not a “power user” I just get the base one and I’m good for a few years. Even now I have the 13 base 128 GB and I’ve only used up around 50 GB (this includes 10GB iOS, 10 GB System data and 11 GB photos and that’s a full 2 year’s worth without enabling optimise photos). I’m guessing this is also why I don’t generally notice a lot of bugs.

Depends on your finances

When it no longer functions.