The SIM card is what gives your phone its identity — it holds your Samsung Galaxy S10's phone number and other identifying information for the cellular network. It might also contain your contacts.
Ordinarily, you won't ever need to remove your SIM card, but it's easy to do if you need to replace it with a new SIM card or perform troubleshooting to resolve a problem with your phone.
You'll need to find the SIM removal tool that came with your Samsung Galaxy S10. It looks like a key, but has a very narrow, needle-like point instead of teeth. If you discarded the phone's packaging and no longer have the SIM tool, you can use a very thin paperclip, as long as it fits in the SIM tray's small opening.
How to remove the SIM card from your Samsung Galaxy S10
1. Turn off your phone by holding the power button on the right side of the phone until you see the Power Off screen. Tap "Power off" and then confirm you want to turn off the phone. Never remove or replace the SIM card when the phone is turned on.
2. Insert the SIM removal tool, or a very thin paperclip, into the hole at the top left of the Galaxy S10, at the edge of the SIM tray. Apply firm force until the tray pops out.
3. You can remove the SIM card by popping it out of the tray from below. Carefully note the orientation of the SIM card so you can replace it later.
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