Replacing the SIM card or memory card in a Samsung Galaxy S7 or Galaxy S7 Edge is a small job with surprisingly high stakes. The tray is thin, the cards are tiny, and one impatient shove can turn a two-minute upgrade into an awkward conversation with a phone repair technician.
Fortunately, Samsung designed both phones with a convenient combined tray on the top edge. The same tray holds a nano-SIM card for cellular service and a microSD card for expandable storage. Once you understand the tray layout and card orientation, replacing either card is simple.
This guide explains how to remove the old cards, install replacements, verify that the phone recognizes them, and solve common problems without treating the tray like a miniature battering ram.
What the SIM Card and Memory Card Actually Do
Although the cards share one tray, they perform completely different jobs.
The nano-SIM card
The nano-SIM connects the Galaxy S7 or S7 Edge to a wireless carrier. It contains information that allows the carrier to identify your subscription and provide calling, text messaging, and mobile data service. The Galaxy S7 series uses a nano-SIM, not a larger micro-SIM or standard SIM. Samsung and AT&T documentation both identify the top tray as a combined nano-SIM and microSD tray.
Changing the SIM does not automatically transfer your photos, apps, passwords, or most other personal files. Those are normally stored in the phone, on the microSD card, or in a cloud account.
The microSD memory card
The microSD card adds storage for photographs, videos, music, downloads, and other files. Samsung originally advertised support for microSD expansion up to 200GB for the Galaxy S7 and S7 Edge. Because regional models and later card capacities can vary, checking the specifications for your exact model number remains the safest approach.
A memory card is optional. Your phone can operate without one, although anyone with an enthusiastic photo habit may discover that internal storage disappears faster than snacks at an office meeting.
What You Need Before Starting
Gather the following items before opening the tray:
- A Samsung SIM-ejection tool or a small straightened paper clip
- A compatible nano-SIM card
- A compatible microSD card, if you are adding or replacing storage
- A clean, dry, well-lit work surface
- A backup of important files stored on the existing microSD card
Remove any protective case that blocks the top edge. Work over a table rather than a carpet, couch, sink, or mysterious gap between furniture. Nano-SIM cards are remarkably skilled at vanishing into alternate dimensions.
Before Removing the Existing Memory Card
If a microSD card is already installed and the phone still works, unmount the card before removing it. Unmounting tells Android to stop reading from or writing to the card, reducing the chance of file corruption.
- Open Settings.
- Tap Storage.
- Select SD card.
- Tap Unmount.
- Wait for the phone to confirm that the card can be removed.
The wording can differ slightly depending on the Android version and carrier software installed on the phone. Samsung specifically warns against removing a memory card while the device is accessing or transferring information because doing so can corrupt data or damage the card.
After unmounting, shut the phone down completely. Do not merely turn off the display.
How to Remove the SIM and Memory Card Tray
Step 1: Power off the Galaxy S7 or S7 Edge
Press and hold the Power button, select Power off, and confirm. Wait until the screen is fully dark and the phone has stopped vibrating or displaying status lights.
Official carrier instructions recommend powering the device off before opening the combined card tray. This protects the cards and prevents interruptions while the phone is actively communicating with them.
Step 2: Find the combined tray
Hold the phone with the screen facing upward. The SIM and microSD tray is located on the top edge of both the Galaxy S7 and S7 Edge. Look for a narrow rectangular outline with a small circular pinhole beside it.
Do not confuse the pinhole with a microphone opening. The tray pinhole sits directly beside the visible tray outline.
Step 3: Insert the ejection tool straight into the hole
Place the tip of the SIM-ejection tool into the tray pinhole. Keep the tool perpendicular to the edge of the phone and press inward gently but firmly.
You should feel a small click as the tray releases. Samsung warns that inserting the pin at an angle can damage the device, so this is not the moment to experiment with creative geometry.
Step 4: Pull the tray out carefully
Once the tray pops out slightly, grip its exposed edge and slide it straight out. Avoid twisting, bending, or rocking it aggressively. The tray is thin and can be damaged if handled roughly.
Place the tray on the table in the same orientation in which it came out. Taking a quick photograph before removing the cards can help you remember the correct layout.
How to Replace the Nano-SIM Card
Step 1: Remove the old SIM
Lift the old nano-SIM out of the smaller recessed area in the tray. If it does not lift easily, turn the tray over above your work surface and let the card fall gently into your hand.
Do not scrape the gold contacts with metal tools. Avoid touching them more than necessary, as skin oils and dirt may interfere with the connection.
Step 2: Check the replacement SIM
Confirm that the replacement is a genuine nano-SIM with clean, undamaged contacts. Do not force a micro-SIM into the tray, and avoid using a poorly cut SIM. A hand-trimmed card may have uneven edges that become trapped inside the phone.
Step 3: Align the notched corner
Match the angled corner of the nano-SIM with the matching shape in the tray. The card should sit flat inside the recess, with its gold contacts facing the back of the phone when the tray is installed. AT&T and Samsung instructions describe the contacts as facing the back or downward.
If the card rocks, overlaps the tray edge, or needs to be held in place with heroic finger pressure, it is probably oriented incorrectly.
How to Replace or Install the MicroSD Card
Step 1: Remove the existing card
Lift the old microSD card from the larger section of the tray. Store it in a protective case, especially if it contains files you have not yet copied elsewhere.
Step 2: Inspect the replacement card
Check the new card for cracks, chipped corners, bent edges, or dirty contacts. Use a card from a recognizable manufacturer and purchase it from a trustworthy seller. Counterfeit memory cards may report an impressive capacity while quietly losing files after their much smaller real capacity is filled.
Step 3: Position the microSD card
Place the memory card in the larger tray recess with its gold contacts facing downward, toward the back of the phone. Match its shape to the tray and press it gently into place. Samsung says the card should be secured in the tray before reinsertion.
Both cards must sit completely flat. A raised card can catch on the slot, bend the tray, or become lodged inside the device.
How to Reinsert the Tray Safely
- Confirm that the nano-SIM and microSD card are seated flat.
- Check that the tray is clean and completely dry.
- Align the tray with the slot in the same direction from which it was removed.
- Slide it straight into the phone using light, even pressure.
- Press until the outer edge is flush with the phone.
Never force the tray. If it stops halfway, remove it and inspect the card alignment. Forcing a crooked tray can bend it, dislodge a card, or damage the internal reader.
Samsung also advises inserting the tray only when it is dry and pushing it fully into the slot to help prevent liquid from entering the phone. The Galaxy S7 series was originally IP68-rated, but the tray still needs to be seated correctly.
Turn On the Phone and Check the New Cards
Confirm that the SIM works
Power on the phone and allow it a minute or two to connect to the carrier. Look for signal bars and the carrier name. Then test:
- An outgoing phone call
- A text message
- Mobile data with Wi-Fi temporarily turned off
A replacement SIM may require activation through the carrier before service becomes available. Carrier locking can also prevent a SIM from another network from working, even when the card fits perfectly.
Confirm that the microSD card works
Open Settings and select Storage. The microSD card should appear with its available capacity. You can also open the My Files app and look for an SD card storage location.
If Android asks to format the card, stop and consider whether the card contains needed files. Formatting erases its contents. Samsung’s Galaxy S7 instructions place the formatting option under Settings, Storage, SD card, and Format.
Common Problems and Practical Fixes
The tray will not eject
Make sure the tool is entering the actual tray pinhole and is held straight. Apply steady pressure rather than stabbing repeatedly. Remove the phone case if it restricts access.
If the tray remains stuck, do not pry it out with a knife or needle. A damaged or jammed tray should be handled by a qualified repair provider.
The phone says “No SIM”
Power the phone off, reopen the tray, and verify that the SIM is sitting flat with the notched corner correctly aligned. Clean obvious dust using a dry, lint-free cloth. Restart the phone and check again.
If the error continues, test the SIM in another compatible phone or contact the carrier. The SIM may be inactive, damaged, incorrectly provisioned, or incompatible with the phone’s network lock.
The microSD card is not detected
Remove and reseat the card after powering the phone off. If possible, test it in a computer or another phone. A card that works elsewhere may need to be backed up and reformatted for use in the Galaxy S7.
If no device can read it, the card may have failed. Memory cards are convenient, but they are not immortal. Important files should exist in at least one additional location.
The tray does not sit flush
Remove it immediately. One of the cards is probably raised, reversed, or outside its recessed area. Inspect the tray for bending and confirm that no debris is inside the slot.
A properly loaded tray should slide in smoothly. “Just push harder” is excellent advice for closing an overstuffed suitcase and terrible advice for smartphone repair.
Frequently Asked Questions
Can I change the SIM without turning off the phone?
It may be physically possible, but Samsung and carrier instructions recommend turning the Galaxy S7 or S7 Edge off before opening the tray. Powering down is the safer procedure.
Can the Galaxy S7 use a micro-SIM?
No. The tray is designed for a nano-SIM. A larger SIM must be replaced through the carrier rather than forced or roughly trimmed.
Does changing the SIM erase the phone?
No. Replacing the SIM normally does not erase apps, photographs, messages, or settings stored in the phone. However, carrier-related features such as voicemail and network configuration may change.
Does replacing the microSD card transfer old files automatically?
No. Copy the files from the old card to a computer, cloud service, or temporary storage, and then transfer them to the new card.
Can I use the SIM tray without a memory card?
Yes. The microSD card is optional. The nano-SIM can remain installed by itself.
Conclusion
Replacing the SIM and memory card in a Samsung Galaxy S7 or S7 Edge is straightforward when you slow down and respect the tray. Power off the phone, unmount the existing microSD card, insert the ejection tool straight, and keep both replacement cards flat inside their matching recesses.
The most important rule is simple: nothing should require force. A properly aligned nano-SIM, microSD card, and tray fit together neatly. Once the phone restarts, test cellular service and check the Storage menu to confirm that the installation was successful.
Real-World Experience: What the Replacement Process Is Like
In practical use, the most difficult part is rarely understanding the instructions. It is handling the tiny cards without letting them shift while the tray is moving. The Galaxy S7 tray is thin enough to feel delicate, especially when both the nano-SIM and microSD card are installed at the same time.
A typical successful replacement begins with good lighting and a cleared table. That may sound overly cautious for such a small task, but it eliminates several common frustrations. On a cluttered desk, the black or metallic tray can disappear among cables, pens, and adapters. A microSD card can also bounce farther than expected when it slips from your fingers.
The ejection step may require slightly more pressure than a first-time user expects. The key is controlled pressure in a straight line. When the pin reaches the release mechanism, the tray usually moves outward only a few millimeters. It does not launch dramatically from the phone like toast from a toaster. You still need to pull it out gently.
Card orientation causes the most hesitation. The easiest approach is to place the empty tray on the table and study the molded shapes. The nano-SIM has a clipped corner that corresponds with the smaller recess. The microSD card has an asymmetrical outline that matches the larger recess. When each card is correct, it looks settled rather than balanced.
One useful test is to lift the loaded tray slightly above the table without turning it upside down. If a card immediately slides around, it may not be properly seated. Correct the position before moving toward the phone. Trying to hold a loose card in place while inserting the tray usually ends with the card shifting at the worst possible moment.
The reinsertion step should feel smooth. There may be mild resistance from the tray seal, but there should not be scraping, crunching, or a sudden hard stop. When resistance appears, pulling the tray back out is faster than gambling on additional pressure. Most alignment problems become obvious once the tray is inspected again.
After startup, cellular service often returns first. The phone may show the carrier name and signal bars within seconds, although activation of a brand-new SIM can take longer. The microSD card may trigger a notification stating that storage has been detected. Older cards can take extra time to scan when they contain thousands of photographs or music files.
The experience is also a reminder that expandable storage is useful but should not be treated as the only copy of valuable data. A microSD card makes it easy to move a large photo library between devices, yet cards can fail or become corrupted. Copying irreplaceable files to another storage location before replacement turns a stressful procedure into a routine upgrade.
Overall, the job usually takes only a few minutes. The best results come from patience rather than technical expertise. Keep the phone off, work somewhere clean, align everything carefully, and stop whenever something does not feel right. That method may lack the excitement of improvised gadget surgery, but it is much better for the patient.
