Hi everyone! I'm looking for a working smartphone (Android of any brand or an iPhone) that someone no longer uses. It can be an older model, and it's okay if the battery doesn't hold a charge, as long as it still powers on when connected to a charger and can work with a SIM card.
I'm working on a university IoT project involving mobile devices, and I need a spare smartphone for testing and development. If you have one lying around that you're willing to give away, it would really help me, and I'd greatly appreciate it.

Thank you so much!

Smart phone (Union city)