Switching phones without losing anything

A well-prepared phone switch takes about an hour and loses almost nothing. An improvised one, done at the shop counter on a Friday evening, loses messages, sometimes photos, and can lock people out of their banking app for days.

The difference comes down to three things: starting while the old phone still works, knowing what never transfers on its own, and not wiping the old device too soon. The rest, modern phones handle well.

What comes across on its own, and what does not

What almost always follows you: contacts, calendar, photos and videos if they were syncing, email, notes, browser bookmarks, your list of apps, and your basic settings. All of that is attached to your Apple or Google account and reappears as soon as you sign in.

What follows with a bit of help: text message history, conversations inside messaging apps, saved passwords, payment cards, tickets and boarding passes.

What does not follow on its own: two-factor authentication codes, banking apps that require reactivation, transit or loyalty apps tied to the device, downloaded files you never filed anywhere, and anything you had not backed up in the first place.

That third list is short. It is also the one that causes every problem.

iPhone to iPhone: the easy case

Apple has made this nearly automatic. You switch on the new iPhone, set it beside the old one, and a prompt appears offering to bring your settings over. The two devices talk directly and copy the essentials, including your apps, which then redownload.

Three things make the difference:

Keep both plugged in and on Wi-Fi. A transfer that stalls at 80 percent is an evening gone.

Take an iCloud backup of the old phone first, even if you plan a direct transfer. It is your safety net if something goes wrong halfway.

Make sure the space is there. If the backup exceeds your free iCloud allowance, it does not happen at all. Apple sometimes offers extra temporary space while you change devices, but do not count on that the night before.

Android to Android

The principle is the same: you can transfer by cable or wirelessly during the new phone’s initial setup. Contacts, calendar and photos come back through the Google account, apps reinstall, and text messages usually follow.

The wrinkle is that every manufacturer adds its own layer on top of Android, with its own transfer tool. Staying with the same brand, nearly everything crosses, including many settings. Changing brand, the Google account does the heavy lifting but incidental things stay behind: home screen layouts, camera settings, alarms.

Also check where your photos genuinely live. Plenty of people assume they are in Google Photos when backup was switched off one day when storage ran short.

Crossing between the two systems

This is the awkward case, and it deserves a quiet evening rather than a lunch break.

In both directions there is an official app made for exactly this, installed before you begin, and run during the new phone’s setup. It handles contacts, calendar, photos and videos well.

What crosses badly:

Paid apps. A purchase made in one store does not carry to the other. An app you bought for $15 on the App Store is an app you buy again on Google Play.

iMessage history. Leaving iPhone, the blue conversations do not land in an Android messaging app. They can be exported, but that is a separate exercise.

Subscriptions. A subscription taken out inside an iPhone app keeps billing through Apple long after the iPhone is gone. You have to deliberately move it or cancel it.

Above all: if you are leaving an iPhone, deregister your number from iMessage before wiping the device. Otherwise texts sent by friends still on iPhone vanish into nothing for weeks and you never see them. It is the most common problem in a move to Android, and it is awkward to fix after the fact.

Two-factor codes: the thing people forget

This is the part almost everyone overlooks, and the one that costs the most time.

If you use an app that generates six-digit codes for your bank, your email or your work account, those codes are often tied to the device rather than to your account. Wiping the old phone without preparing the move means losing access to every service that depends on them, all at once.

Some authenticator apps now offer syncing to an account, which solves this, but it has to have been switched on beforehand. Others require you to export your accounts from the old phone, or to set each one up again on the new one.

The right sequence:

1. Open the authenticator app on the old phone and write down which accounts are in it.
2. Find its transfer or export function and use it before erasing anything.
3. For your most important accounts, set up the second factor again from the new phone, keeping the old one switched on beside you to approve the change.
4. Collect your backup codes and store them somewhere other than the phone.

If any of this is unfamiliar, our piece on two-factor authentication explains the whole mechanism and why it remains worth the inconvenience.

Messaging apps have their own rules

Text messages are handled by the phone. Everything else is handled by the app that owns the conversation, and each one does it differently.

Most messaging apps store your history on the phone rather than on their servers, which is good for privacy and inconvenient here. The usual pattern is that you start a backup or a transfer from inside the app on the old phone, before signing in on the new one. Sign in on the new phone first, and you often get a working account with an empty conversation list, with no way back.

So before you begin, open each messaging app you actually care about, find its backup or chat transfer setting, and run it. It takes five minutes per app and it is the difference between keeping ten years of family conversation and starting from a blank screen.

Banking apps and wallets

Banking apps and stored payment cards do not transfer like everything else. For security reasons they reactivate on the new device: a fresh sign-in, usually a code by text, sometimes a confirmation call.

Two practical notes. First, do these reactivations once your phone number is live on the new device, not before. Second, keep the physical cards within reach: reactivation often asks for the last digits, the expiry date, or a recent transaction.

SIM cards and eSIM

If your phone uses a physical SIM, it moves in thirty seconds with the little tool in the box, provided the format matches.

With an eSIM, the line is registered inside the device rather than on a card. It moves through a process you start in the settings, or with a code from your mobile provider. It works well, but expect the line to be inactive for a few minutes on both sides. Do not start it if you are waiting on an important call within the hour.

One small detail with real consequences: during those minutes without service you receive no texts, and therefore no verification codes. Move the line first, then do the app reactivations.

Before you wipe the old phone

Do not erase it the same day. Work through this list first:

1. Open every important app on the new phone and confirm you are signed in: email, bank, messaging, photos.
2. Compare the photo count on both devices. It is crude, but it catches a half-transferred library.
3. Check text messages from the past year, not just the past week.
4. Deregister iMessage if you are leaving iPhone.
5. Remove the device from your Apple or Google account, which also clears activation lock before any resale.
6. Then erase it with the full factory reset, not by deleting files one by one.

How long to keep it

Two to four weeks, switched on and charged occasionally, at home. That is how long it takes to notice what is missing, because you never notice in a day: you notice three weeks later, hunting for a specific photo or trying to sign in to a service you use twice a year.

After that, if the device still has value, trading it in or selling it is reasonable. If not, a wiped old phone makes a very good spare for travel, or a kitchen music player.

If a phone switch worries you, or if you are helping a parent who would rather not end up locked out of their own bank, that is exactly what our phones and tablets service is for. Much of it can be done remotely, with both devices in front of you.