Introduction

If you’ve just purchased a Samsung Galaxy S25 Ultra, the first step to activating your device is inserting a Nano SIM card. Doing this incorrectly can damage the delicate SIM tray or the phone itself. This guide walks you through the entire process, ensuring your SIM card is installed safely and correctly.

Tools Needed

  • SIM eject tool: Included in the Galaxy S25 Ultra box.

  • Alternative: A straightened paperclip can be used if the tool is unavailable.

Step 1: Locate the SIM Tray

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

Look for a small pinhole next to the tray. Be careful not to confuse it with the microphone hole.

Step 2: Remove the SIM Tray

  1. Insert the SIM eject tool or paperclip into the pinhole.

  2. Apply gentle pressure until the tray pops out slightly.

  3. Carefully pull out the tray completely.

Step 3: Insert Your SIM Card

The Galaxy S25 series supports dual SIM cards, allowing two Nano SIMs simultaneously:

  • 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 matches the tray shape.

  • The gold contacts on the SIM should face upward.

  • If using two SIMs, place SIM 2 on the back first, then SIM 1 in the front.

Step 4: Reinsert the Tray and Power On

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

  2. Press the side power button to turn on the device.

  3. Enter your SIM PIN code if prompted.

Once complete, your Galaxy S25 Ultra will connect to your mobile network, and you can start making calls, sending messages, and using mobile data.

Summary

Inserting a SIM card into the Samsung Galaxy S25 Ultra is straightforward but requires careful attention. By following the steps above, you can safely install one or two SIM cards without damaging the tray or microphone. Proper installation ensures reliable access to mobile networks, internet, and communication services.

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