Q&A for How to Change a Sim Card in an iPhone

Try something that wont harm the circuts, like a pencil popping it up, or take it to your nearest repair shop.

If you have an iPhone on the current iOS, go to the Settings app. Then find "Sounds and Haptics". Click on "Ringtones" and there will a list of them to choose from. You can also purchase more ringtones from Apple's ringtone store.

You will not because your contacts are saved to your iCloud account or whatever other account you have selected.

If your phone is unlocked, switching from a Japanese SIM to a UK SIM should work immediately in the UK. Make sure your phone is not carrier-locked and supports UK network bands. You might need to update APN settings for the UK carrier, which you can find on their website. Make sure roaming settings are enabled if there are connection issues, then insert the UK SIM, and it should work if everything is compatible.

If your phone doesn't have a SIM card tray and requires removing the back cover, first turn off the phone to avoid any damage. Look for a small gap or notch along the edge of the back cover, which could be near the charging port or camera. Use a plastic pry tool or your fingernail to gently lift the cover starting at the gap, being careful not to apply too much pressure or use metal tools to avoid scratching. Once the back cover is removed, insert the SIM card into the designated slot. Then, snap the back cover back into place. If you're unsure, refer to the phone’s manual or search for specific instructions for your model.

The iPhone 12 should automatically detect the SIM card, and you should be able to make calls, send texts, and use mobile data right away. If the phone doesn’t recognize the SIM, try restarting it or entering your PIN (if set). If you're switching to a new carrier or your SIM card is not compatible, you might need to contact your carrier to activate the SIM or get a new one.