How do you open an Iphone to place a SIM card?

How do you open an Iphone to place a SIM card? - 1

There's a lil hole on the side and you should stick a paper clip in it to open the slot

You don't open the iPhone.

https://support.apple.com/...s/HT201337

You don't!
There's a little tool in the box that opens a little compartment for the SIM card.
Read the instructions or visit an Apple shop

Use the (usually) included SIM ejector tool to pop open the SIM tray on the right of the iPhones sold today.

Just get a screwdriver, shove it in the side, twist, then with a pair of pliers pull the back off. Remove the sim card using a vacuum cleaner, then put the back of the phone back on using a hammer and some nails.