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How to Prepare Your Phone for Selling: Complete Checklist Singapore 2026

Prepare phone for selling checklist

How to Prepare Your Phone for Selling: Complete Checklist

You’ve decided to sell your iPhone or Samsung Galaxy. Smart move—but before you hand it over to the next owner, there are critical steps you must take to protect your data, maximize resale value, and ensure a smooth transaction.

Skip even one of these steps, and you could: lose precious photos forever, have your banking apps accessed by strangers, get lowballed because of “hidden issues”, or face angry callbacks from buyers weeks later.

This is your complete pre-sale checklist. Follow it step-by-step.

Last updated: February 2026

⚠️ Warning: Factory resetting WITHOUT signing out first triggers Activation Lock (iPhone) or Factory Reset Protection (Android). The buyer won’t be able to use the phone. Do these steps IN ORDER.

Step 1: Back Up Everything

The Problem: You factory reset your phone, then realize you forgot to save your photos, WhatsApp chats, or important documents. Once wiped, data is gone forever.

What’s Happening: Cloud backups aren’t automatic for everything. Photos might sync to iCloud/Google Photos, but WhatsApp chats, app data, and custom settings require manual backup.

Real-World Example: You sell your iPhone, then realize your 2-year WhatsApp chat history with your late grandmother is gone forever because you forgot to back up WhatsApp separately from iCloud.

What to Do: iPhone: Settings > [Your Name] > iCloud > iCloud Backup > Back Up Now. Wait for “Last successful backup: Today.” Android: Settings > Google > Backup > Back Up Now. WhatsApp (both): WhatsApp > Settings > Chats > Chat Backup > Back Up.

Step 2: Sign Out of All Accounts (CRITICAL)

The Problem: You factory reset without signing out. The buyer gets stuck at a “Hello” screen demanding YOUR Apple ID or Google password. They can’t use the phone at all.

What’s Happening: Activation Lock (iPhone) and Factory Reset Protection (Android) are anti-theft features that require the original owner’s login to reactivate after a factory reset. If you reset without signing out first, the lock stays active.

Real-World Example: You sell your iPhone to someone on Carousell. Three days later, they call you furious because they can’t set it up—it’s asking for your Apple ID password. You now have to meet them again to unlock it.

What to Do: iPhone: Settings > [Your Name] > Sign Out (enter Apple ID password). Android: Settings > Accounts > Remove each Google/Samsung account. This MUST be done BEFORE factory reset.

Step 3: Remove SIM & Memory Card

The Problem: You sell your phone and realize your SIM card (with your phone number) or microSD card (with private photos) is still inside.

What’s Happening: SIM cards aren’t visible when the tray is closed. MicroSD cards hide in the same slot (Android). People forget to physically check before selling.

Real-World Example: You sell your Samsung Galaxy, and the buyer contacts you days later saying they found your SIM card with your number on it. They could have accessed your telco account or made calls under your name.

What to Do: Use the SIM ejector tool (or paperclip) to pop out the tray. Physically check BOTH sides of the tray—some phones have dual SIM + microSD slots.

Step 4: Check IMEI Status

The Problem: You try to sell your phone but get rejected because the IMEI is blacklisted (reported stolen or unpaid installment).

What’s Happening: If a phone was reported lost/stolen or still has unpaid installments to a telco, its IMEI gets blacklisted. Blacklisted phones can’t be activated on Singapore networks and have near-zero resale value.

Real-World Example: You bought a second-hand iPhone from someone online. Now you want to sell it, but shops reject it because the previous owner reported it stolen to claim insurance. You’re stuck with a useless phone.

What to Do: Dial *#06# to get your IMEI number. Check it at imei.info or imeicheck.com. Must show “Clean” status. If blacklisted, you can only sell for parts (very low value).

Step 5: Check Battery Health

The Problem: You think your battery is fine, but when the buyer tests it, they discover it’s at 75% health and demand a price reduction or walk away.

What’s Happening: Battery health directly affects resale value. Below 80% is considered degraded, and buyers expect 15-25% discount. Shops test this immediately, so you can’t hide it.

Real-World Example: You quote $1,200 for your iPhone 15 Pro based on online prices. The shop tests battery health—70%—and offers only $900. You wasted your time traveling there.

What to Do: iPhone: Settings > Battery > Battery Health. Check Maximum Capacity. Android: Download AccuBattery app, charge to 100%, check Health %. Know this BEFORE quoting prices.

Step 6: Gather Original Accessories

The Problem: You can’t find the original box or charging cable. You lose 10-20% of potential resale value.

What’s Happening: Buyers perceive “full set” (box + accessories) as better cared-for. Shops can resell complete sets at higher prices, so they pay you more.

Real-World Example: Two identical iPhone 15 Pro 256GB. One has the original box and cable—sells for $1,350. The other has no box—sells for $1,150. That’s a $200 difference.

What to Do: Include: Original box, charging cable, charging brick (if originally included), earphones (older iPhones), SIM ejector tool, warranty card. Don’t have the box? You’ll still get fair value, just slightly less.

Step 7: Clean Your Phone

The Problem: Your phone is covered in fingerprints, dust in the charging port, and smudges on the camera lens. It looks neglected even though it works perfectly.

What’s Happening: First impressions matter. A dirty phone makes buyers think it was poorly maintained, lowering their offer even if there’s no actual damage.

Real-World Example: You bring a perfectly functional iPhone to sell, but the screen has greasy fingerprints and the charging port is full of lint. The buyer offers $100 less because it “looks old.”

What to Do: Screen/back: microfiber cloth + tiny bit of isopropyl alcohol. Camera lens: gentle wipe. Charging port: wooden toothpick to remove lint. Speaker grills: soft brush. Takes 5 minutes, increases value.

Step 8: Factory Reset (FINAL STEP)

The Problem: You factory reset too early (before backing up or signing out), losing your data or triggering Activation Lock.

What’s Happening: Factory reset erases everything permanently. If done in the wrong order, you lose data or create problems for the buyer. This must be the LAST step.

Real-World Example: You factory reset first, then realize you never backed up your photos. They’re gone forever. Or you reset without signing out of Apple ID, and now the buyer can’t activate the phone.

What to Do: Only after completing ALL previous steps: iPhone: Settings > General > Transfer or Reset iPhone > Erase All Content and Settings. Android: Settings > System > Reset > Factory Data Reset. Wait for “Hello” screen.

Quick Checklist Summary

  • [ ] Back up to iCloud/Google Drive
  • [ ] Back up WhatsApp separately
  • [ ] Sign out of Apple ID / Google Account
  • [ ] Remove SIM card and memory card
  • [ ] Unpair smartwatches (if any)
  • [ ] Check IMEI status (must be clean)
  • [ ] Check battery health
  • [ ] Gather original box and accessories
  • [ ] Clean phone physically
  • [ ] Factory reset (LAST STEP)

Ready to Sell? Get Instant Cash

Now that your phone is properly prepared, sell it at Certified Phone Repairs SG:

  • Instant quote: WhatsApp +65 9678 0203
  • Fair market prices (90-95% of Carousell rates)
  • Cash in 15-20 minutes
  • 3 locations: Ang Mo Kio, Bugis, WestGate
  • We buy ANY condition (even cracked screens)

Open Daily: 11:00 AM – 9:00 PM