On this page
- The quick verdict
- Unlocking a Samsung Galaxy before selling at a glance
- What Does “Unlocked” Mean?
- How to Check If Your Samsung Galaxy Is Unlocked
- Unlocking Your Samsung Galaxy Through Your Network
- Unlocking Without the Original Network
- Remove Google Account Locks Before Selling
- How to Factory Reset Your Samsung Galaxy
- Do I Have to Unlock My Phone Before Selling?
- Selling Your Samsung Galaxy After Unlocking
- Frequently asked questions
If you’re planning to sell your Samsung Galaxy phone, unlocking it first is one of the most important steps. An unlocked phone can be used on any UK network, which makes it more valuable and much easier to resell.
The quick verdict
Check whether your Galaxy is already unlocked by trying a SIM from another UK network. If it is locked, ask your network for an unlock code, which most UK networks must provide free once your contract has ended. Then sign out of your Google account, remove screen locks and factory reset the phone, because Factory Reset Protection can stop the next owner setting it up.
Unlocking a Samsung Galaxy before selling at a glance
| Step | What to do | Why it matters |
|---|---|---|
| Check the lock | Try a SIM from another UK network | It may already be unlocked |
| Find your IMEI | Dial *#06# on the phone | Networks need it to unlock |
| Ask your network | Request a free unlock code | Usually arrives within a few days |
| No network access | Use a reputable third-party service | Usually a small fee |
| Remove FRP | Sign out of Google, disable screen locks | Lets the next owner set it up |
| Factory reset | Settings, General management, Reset | Wipes your data |
Thankfully, unlocking a Samsung Galaxy is usually straightforward - and in many cases, your phone may already be unlocked without you realising.
What Does “Unlocked” Mean?
A Samsung Galaxy phone is considered unlocked when it isn’t tied to a specific mobile network. This means the next owner can insert a SIM from any UK provider and use the phone without restrictions.
Unlocked phones typically:
- sell for a higher price
- appeal to more buyers
- work immediately on any network
How to Check If Your Samsung Galaxy Is Unlocked
The quickest way to check is by inserting a SIM card from a different network.
Steps:
- turn off your phone
- insert a SIM from another UK network
- turn the phone back on
If the phone connects to the network and allows calls or data, it’s already unlocked. If you see a message asking for an unlock code, the phone is locked.
Unlocking Your Samsung Galaxy Through Your Network
In the UK, most networks are required to unlock phones for free once any contract has ended.
You’ll usually need:
- the phone’s IMEI number
- your account details (if still available)
You can find the IMEI by dialling *#06# on your phone.
Once requested, networks typically provide an unlock code within a few days. Entering this code permanently unlocks the device.
Unlocking Without the Original Network
If you no longer have access to the original network account, third-party unlocking services are available online. These services usually charge a small fee and require the IMEI number.
Always use a reputable provider and avoid services that promise instant unlocking without any details.
Remove Google Account Locks Before Selling
Unlocking the network isn’t the only step. Samsung phones also use Factory Reset Protection (FRP), which locks the device to your Google account.
Before selling, make sure you:
- sign out of your Google account
- disable any screen locks
- factory reset the phone
This ensures the phone can be set up by the next owner without issues.
How to Factory Reset Your Samsung Galaxy
Steps:
- go to Settings
- tap General management
- select Reset
- choose Factory data reset
Make sure all accounts are removed before resetting.
Do I Have to Unlock My Phone Before Selling?
While some platforms accept locked phones, unlocking your Samsung Galaxy usually results in:
- a higher valuation
- a smoother inspection process
- faster resale
If unlocking isn’t possible, be honest about the phone’s status when selling to avoid price adjustments.
Selling Your Samsung Galaxy After Unlocking
Once your phone is unlocked, reset and ready to go, you can sell it quickly online. Using a specialist trade-in service avoids private listings and negotiations.
You can check your valuation and sell your Samsung Galaxy phone through Envirofone’s Samsung trade-in service, which offers instant quotes, free postage and cash payments - even for well-used or damaged devices.
Unlocking your phone before selling is a small step that can make a noticeable difference to the final price.
Frequently asked questions
How do I know if my Samsung Galaxy is unlocked?
Turn off the phone, insert a SIM from another UK network and turn it back on. If the Galaxy connects and allows calls or data, it is unlocked. If it asks for an unlock code, it is locked.
Will my network unlock my Samsung phone for free?
In the UK, most networks are required to unlock phones for free once any contract has ended. You will usually need the IMEI number and your account details, and the unlock code typically arrives within a few days.
How do I find my Samsung IMEI number?
Dial *#06# on your Samsung Galaxy to display the IMEI number. Networks and third-party unlocking services need it to unlock the phone.
What is Factory Reset Protection on Samsung phones?
Factory Reset Protection, or FRP, locks a Samsung phone to your Google account. Before selling, sign out of your Google account, disable any screen locks and factory reset the phone so the next owner can set it up.
Do I have to unlock my Samsung before selling it?
Not always, as some platforms accept locked phones, but unlocking usually brings a higher valuation, smoother inspection and faster resale. If unlocking is not possible, be honest about the phone's status to avoid price adjustments.
