How do I know if my contacts are saved to my phone or SIM?
Do contacts automatically save to SIM card on iPhone?
No, iPhones don't save contacts to the SIM. Most likely, you had saved the contacts to that spare SIM from another phone. iPhone stores no data in SIM card. The old Contacts that you see was from your previous phone.3 Jul 2013
How do I know if my contacts are saved to my SIM card?
Go to contact in settings, then you can see import/ export dialog to & from phone to sim1 or sim2 or Google contact, where you can export the contact numbers from Google account also… Back when GSM phones came out in the 1990s and early 2000s, contacts were stored on SIM cards.