How to Back Up, Transfer and Wipe Your Phone Data Safely

Your phone is easy to replace. Everything on it is not.

Think about what actually lives on your phone. Years of photos, every contact you have ever saved, bank apps, work email, the two-factor codes that guard the rest of your life. The handset has a resale value. The data on it is close to irreplaceable, and in the wrong hands it becomes a real problem.

So when you upgrade, three things need to happen, and the order matters: back up what you have, move it to your new phone, then wipe the old one clean before it leaves your hands. Do them out of sequence and you can lose photos for good, or pass a stranger a phone still signed into your accounts.

None of it is difficult once you know the steps. We move a lot of devices through the OzMobiles testing lab, so we see exactly where people come unstuck. This guide covers all three stages for both iPhone and Android, including every direction of switch: iPhone to iPhone, Android to Android, and hopping between the two.

Grab your old phone, your new one, and about an hour. Let's get your data sorted properly.

Three jobs, one order: back up, transfer, erase

Almost every data mishap comes from doing these out of order or skipping one. Back up first, so you always have a copy to fall back on. Transfer second, while both phones are still working and signed in. Erase last, once you have confirmed everything landed safely on the new device.

Here is the whole process at a glance. The rest of this guide is simply each of these three steps done properly, on whichever phones you own.

Step 1: Back up everything, starting with your photos

Photos are what people cry over, so start there. The goal is simple: get your data into the cloud, where it is safe even if the phone is lost, wiped or damaged. If you want extra peace of mind, keeping a second copy somewhere else, like a computer, is a smart move, but the cloud backup is the part that matters most.

Photos and videos

On iPhone: the built-in option is iCloud Photos. Go to Settings, tap your name at the top, tap iCloud, tap Photos, and switch on "Sync this iPhone". Every photo and video then lives in iCloud as well as on the phone. The catch is that Apple only gives you 5GB free, which a camera roll swallows quickly. You have three ways around that: upgrade to iCloud+ (50GB or 200GB for a few dollars a month), install the free Google Photos app and let it back up your library to your 15GB Google account as a second copy, or plug the phone into a computer and drag the photos off by hand.

On Android: open the Google Photos app, tap your profile picture, tap "Photos settings", tap "Backup", and switch it on. Your photos go to the same 15GB Google storage shared with Gmail and Drive. If that fills up, you can buy a Google One plan or offload photos to a computer.

The computer method (both phones): plug the phone in with a cable. On a Mac use the Photos app or Image Capture; on Windows use the Photos app or open the phone in File Explorer and copy the DCIM folder. This gives you a physical copy that does not depend on any account.

Do not skip this check: open your photo app and confirm it says "Backup complete", or shows no "waiting to upload" banner, before you wipe anything. Trusting that backup is on, without looking, is the single most common way people lose photos.

Contacts, calendars and notes

These are the easy ones because they sync quietly in the background. On iPhone, go to Settings, your name, iCloud, and make sure Contacts, Calendars and Notes are switched on. On Android they are tied to your Google account, so as long as you are signed in they are already saved. This is why your contacts simply reappear on the new phone the moment you log in.

Text messages and chats

On iPhone, turn on Messages in iCloud (Settings, your name, iCloud, then Messages) so your text history is stored too. On Android, your SMS and MMS are included in the Google One backup at Settings, Google, Backup.

WhatsApp is the one everybody forgets, because it does not ride along with the phone backup. It keeps its own. Open WhatsApp, tap Settings, Chats, then Chat Backup, and run it manually the night before you switch. On iPhone it saves to iCloud, on Android it saves to Google Drive. Signal, Telegram and other chat apps each have their own backup setting too, so give them a look if you rely on them.

Files, documents and downloads

On iPhone your documents live in iCloud Drive, reachable through the Files app. On Android they sit in Google Drive. The folder people forget is Downloads: bank statements, PDFs, tickets. Open your Files or Downloads folder and move anything important into Drive, or copy it to a computer, before you wipe.

Step 2: Move everything to your new phone

The golden rule here is timing. Do the transfer while both phones are charged, switched on and connected to Wi-Fi, and before you erase anything on the old one. Most transfers happen during the new phone's first-time setup, so if you have already set yours up, you may need to reset it to bring back the "copy your data" screen. Pick the path that matches your switch.

iPhone to iPhone: Quick Start

The simplest of the lot. Turn on the new iPhone and hold it close to your old one. A "Set Up New iPhone" prompt appears on the old phone. Follow it, scan the swirling pattern with the old camera, then choose "Transfer from iPhone" to send everything directly across, or restore from your iCloud backup instead. Keep both phones near each other and plugged in until it finishes. Apps, photos, settings and even your home screen layout come with it.

Android to Android: Copy apps & data

When you power up the new phone, the setup wizard offers "Copy apps & data". Connect the old phone with a cable for the fastest transfer, or go wireless, sign into your Google account, and choose what to bring: apps, photos, contacts, messages, even your wallpaper. If both phones are Samsung, Smart Switch does the same job and carries a few extra Samsung-specific items. Already finished setup? You can still run Smart Switch from Settings, or reset the phone to get the wizard back.

Android to iPhone: Move to iOS

Apple makes a free app for exactly this, called Move to iOS. On the new iPhone, at the "Apps & Data" setup screen, choose "Move Data from Android". Install Move to iOS on the Android phone, open it, and type in the code the iPhone shows you. The two connect over a private Wi-Fi network and copy your contacts, message history, camera photos and videos, mail accounts, calendars and web bookmarks. Any free apps that exist on both stores are added to your App Store list, ready to download.

iPhone to Android

Which tool you use depends on the phone you are moving to:

Samsung Galaxy: use Smart Switch. Connect with a USB-C cable or go wireless, and it can even pull your content straight from your iCloud backup. Your Apple ID and password are used only to sign in and are not stored by Samsung.
Google Pixel: during setup, choose "Copy from iPhone" and use the cable or adapter in the box.
Any other Android: install Google's "Switch to Android" app on your iPhone and scan the QR code shown on the new phone.

Turn off iMessage before you leave iPhone. If you skip this, Apple can keep routing texts from iPhone friends into iMessage, where they vanish before they reach your Android phone. On the iPhone, go to Settings, Messages, and switch iMessage off. Already wiped the iPhone? Deregister your number at Apple's iMessage page (selfsolve.apple.com/deregister-imessage) so your messages start arriving again.

Step 3: Erase the old phone the right way

This is the step people rush, and it is the one that bites. A proper erase does two jobs: it removes your personal data, and it unlinks the phone from your accounts so the next owner can actually switch it on. Miss that second part and the phone locks itself the moment it restarts. Only do this once you have opened your new phone and confirmed everything made it across.

Two things are gone for good the instant you wipe, so handle them first: your authenticator app and your eSIM. Both are covered in the checklist further down, and both can lock you out if you erase before sorting them. When your accounts and number are safely on the new phone, work through the steps below.

On iPhone: sign out first, then erase

1. Take one last backup: Settings, your name, iCloud, iCloud Backup, then Back Up Now.
2. If you have an Apple Watch, unpair it first (open the Watch app, tap your watch, then Unpair).
3. Sign out of your Apple Account: Settings, your name, scroll to the bottom, Sign Out, and enter your password. This releases Activation Lock.
4. Erase: Settings, General, Transfer or Reset iPhone, Erase All Content and Settings. Enter your passcode and Apple Account password to confirm.

That final step wipes the phone back to factory condition and switches off Find My and Activation Lock for you, so the phone is ready for its next owner rather than locked to you.

On Android: remove your accounts first, then reset

1. Take one last backup: Settings, Google, Backup, then Back up now.
2. Remove your Google account: Settings, Passwords & accounts, tap your Google account, then Remove account. On a Samsung, remove your Samsung account the same way.
3. Switch off Find My Device in Settings.
4. Factory reset. On a Pixel or stock Android: Settings, System, Reset options, Erase all data (factory reset). On a Samsung: Settings, General management, Reset, Factory data reset.

Why removing the Google account first matters. Skip it and a security feature called Factory Reset Protection kicks in. On its next start-up the phone demands the previous owner's Google login, and without it the device is a paperweight. It is the number one reason a phone lands in our testing lab stuck on a lock screen. Two minutes now saves a lot of back-and-forth later.

If the phone is locked, broken or won't turn on

You can still wipe it remotely from any computer. For an iPhone, sign in at icloud.com/find, select the device, choose Erase, then Remove from Account. For an Android, go to android.com/find, pick the phone, and choose Factory reset. Both clear your data and cut the account link even when the screen itself is dead.

The easy-to-forget stuff that catches people out

Backing up, transferring and wiping covers the big three. These are the smaller items that slip past people, and a couple of them can lock you out of your own accounts if you miss them. Run through this list before the phone leaves your hands.

If your two-factor codes live in Google Authenticator, install it on the new phone and use its built-in transfer before you wipe the old one.

How OzMobiles handles your data

Here is the part that should put your mind at ease. Every phone that arrives at our facility, whether you sold it to us or traded it in, goes through our 80-point Phonecheck test before it is resold. That process includes a certified data wipe, so the device is cleared to industry standard on our end, whatever you did or did not manage to erase yourself.

Think of that as a safety net rather than a reason to skip your own wipe. Doing your part first is still the right move, because it protects your accounts the moment the phone leaves your hands and keeps the handover clean from the start. But if you miss a step, or the phone was too damaged to reset, our technicians catch it. If you want the full picture of what that certification covers, it is worth reading our guide to what Phonecheck certification actually checks.

The same standard runs in the other direction. When you buy a refurbished phone from us, it has already been wiped and certified before it reaches you, so it lands as a clean slate with none of the previous owner's data on it. That holds true whether it is your first refurbished phone or your fifth.

One last thing: if you have already posted a phone to us and realised you never wiped it, contact our team as soon as you can. If it has not been processed yet, we can often pause it so you can erase it remotely first.