Help please (iphone)?

So something happened to me and I urgently need your help: I changed the password (unlock code) on my phone (iPhone), then I clicked cancel and turned it off, not completely, and then entered my old password, nothing happened (so it was the wrong one), then I entered the new one, nothing happened, then I…

I want to buy an iPhone 7 Plus. Does that still make sense or not?

Apple experts, please give me some feedback on whether it still makes sense to buy such an old phone or not. • Can I update apps in the App Store? • Does iCloud work and can I claim additional storage? • Is the camera working properly? • What should I have renewed in case of…