What does it mean if a SD or SIM card is missing in iphone 6s?
I am looking to purchase a new or used iphone 6s from a private seller. The description of this product lists the following notice: "Phone does not come with SD or SIM card where applicable."
After googling for a while, I cannot find a clear answer to what the function of the SD or SIM card does. I wasn't aware that internal iphone hardware could be removed, which only furthers my confusion.
1) What does the SD Sim Card in iphone 6s do?
2) If it is missing from a phone, can I still connect it to my current Sprint network?
3) What is at risk for a missing SD or Sim Card?
Please help, tech users! I would really appreciate a clear and thorough explanation. Answer as if you're explaining this to someone who is unfamiliar with phone tech, account set up, cloud interface, etc. I need to make a wise purchase, so I am depending on your expertise!
Thanks.
iPhone 6s