Trade-in offers, upgrade deals and marketplace listings make it tempting to wipe an old phone in a hurry. For your accounts, that moment is risky. If the phone is the only place your login codes exist, a factory reset can remove access to email, banking, social media and work tools in one step.
This guide follows a timeline: what to do before you reset, how to handle the reset itself, and how to clean up afterward.
Preparation prevents nearly every lockout. Do this while the old phone still works and is still in your hands.
Open your code generator and list every entry. Group them by importance:
Critical: primary email, banking, payment services, cloud storage.
Important: social media, shopping, work and school accounts.
Low priority: forums, trial services, old sign-ups.
Handle the critical group first. If an entry belongs to an account you no longer use, this is a good moment to close it.
For each critical account, check whether you have a recovery code, a registered backup phone number or another trusted device. Save any missing codes in a password manager. Having these in hand turns a possible disaster into a short detour.
Some apps can transfer entries directly to a new phone, some use an encrypted cloud backup and some require you to add each account again. Our guide to an authenticator app reset explains the differences in terms of what is preserved and what is lost.
The order of operations is the most important part of the process.
Install your code generator on the new device.
Restore or transfer your entries using the method you chose.
Compare the entries to your inventory list.
Do not touch the old phone yet.
Log out of each critical account on a computer and sign back in using the code from the new phone. If a code is rejected, check that the date and time are set to automatic, then try again. Only when every critical account passes should you consider the old phone ready to wipe.
Leave the old device powered off and untouched for a few days if you can. A short waiting period reveals any forgotten accounts, such as a work login you only use once a week.
A factory reset removes the data on the phone, but accounts still hold records of the old device.
Sign out of your cloud and device accounts first.
Remove any screen lock only if the process requires it, then erase all content and settings.
Remove the SIM card and any memory cards.
Confirm that the phone is no longer linked to your account, so the buyer does not hit an activation lock.
Check the security settings of important accounts and remove the old phone from lists of trusted or signed-in devices. Update the phone number on file if it is changing.
Add a screen lock, enable biometric protection in the code generator and check that backups are running. A free authentication app with these protections is a good fit for the new setup.
If your number is changing, update it with each service before you cancel the old SIM. Otherwise, text codes may keep going to the old number, or to its next owner.
If the old phone is gone, you cannot transfer anything. Use the recovery codes you saved, a second trusted device or each service's official recovery flow. This is slower, which is why preparation matters.
Cross-platform moves are more likely to need manual re-enrollment. If you are heading to an iPhone, installing an authentication app before you start gives you a place to add each account as you go.
A factory reset removes the data from the phone, but it does not remove the phone from your accounts. Sign out of your cloud and device accounts first, remove the device from your trusted lists and confirm that the buyer will not meet an activation lock. Encrypting the phone before the reset is another common safeguard on many devices.
Any device that holds codes or is signed in to your accounts should follow the same process. Smartwatches paired to your phone often keep their own sessions, so unpair them before you wipe the phone.
If you can, keep it for one to two weeks after the move, powered off and stored safely. That gives you time to notice a forgotten account or a missed recovery code before the data is gone.
The most common mistake is resetting the old phone before confirming that codes work on the new one. If a single critical account relied on that device, the only way back may be a slow recovery process.
Annual services, tax portals and travel sites often hide in your code list. Scroll through every entry, not just the ones you use weekly, and decide what to do with each before the wipe.
Changing numbers, emails or devices without updating accounts is a quiet cause of lockouts. Make a short note of every security setting that needs a new phone number or address.
List accounts and rank them.
Save recovery codes.
Choose a transfer method.
Set up the new phone first.
Test every critical login.
Wipe the old phone only after success.
Remove the old device from account settings.
A reset does not have to be stressful. Move first, test second and wipe last, and the process becomes routine.