If you’ve just purchased the Samsung Galaxy S25 Ultra, the first step to activate your device is inserting a Nano SIM card. This guide explains the process step by step to ensure you insert your SIM correctly without damaging the phone.

Required Tool

The package includes a SIM ejector tool. If you can’t find it, a straightened paperclip can serve as a replacement.

Locate the SIM Card Tray

The SIM tray is located at the bottom edge of the Galaxy S25 Ultra.

  • Look for a small hole next to the tray.

  • Be careful not to confuse it with the microphone.

Remove the SIM Tray

  1. Insert the SIM ejector tool or paperclip into the tray hole

  2. Apply gentle pressure to pop out the tray slightly

  3. Carefully pull out the tray

Insert the SIM Card (Single or Dual SIM)

Galaxy S25 series supports dual SIM cards:

  • Front side of the tray: Primary SIM (SIM 1)

  • Back side of the tray: Secondary SIM (SIM 2)

📌 Important Tips:

  • Ensure the cut corner of the SIM card matches the tray shape

  • The gold contacts should face upwards

  • If using two SIM cards, insert the secondary SIM first, then the primary SIM

Close the Tray and Power On

  1. Gently push the tray back into the phone until it is fully seated

  2. Turn on the phone using the side button

  3. Enter the SIM PIN code if prompted

Now, your Galaxy S25 Ultra is connected to the mobile network and ready for calls, messaging, and internet use.

Conclusion

Inserting a SIM card in the Samsung Galaxy S25 Ultra is simple but requires attention to avoid damaging the microphone or tray. Following these steps ensures safe setup and seamless mobile connectivity.

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