Quick Answer
There are three types of “locks” on a Galaxy S25. Here’s the fast version for each:
Unlock the Screen (PIN, Pattern, Biometrics)
The Samsung Galaxy S25 series gives you several ways to secure your lock screen — and just as many ways to unlock it. If you’ve set up your phone’s security and just need a refresher on how each method works, here’s the breakdown:
Enter your 4–6 digit PIN on the lock screen keypad. Simple and reliable.
Draw your pattern on the 9-dot grid. Fast but slightly less secure than PIN.
Type an alphanumeric password. Strongest option but slowest to enter.
Place your finger on the ultrasonic in-display sensor. Works in under 0.5 seconds.
Look at the front camera to unlock instantly. Less secure than fingerprint.
Auto-unlock at trusted locations, with trusted devices, or while on-body.
How to Set Up or Change Your Screen Lock
You can set up or change your screen lock type anytime. If you switch methods, your existing biometric data (fingerprints, face scan) will be erased and you’ll need to re-register them.
The Galaxy S25 series uses an ultrasonic fingerprint sensor embedded under the display. You can register up to 4 fingerprints. For best results, register the same finger twice at slightly different angles — it dramatically improves recognition speed.
Face unlock uses the front camera to scan your face. It’s faster than fingerprint for quick access but less secure (it uses 2D recognition, not 3D like Apple’s Face ID). You need a backup PIN/pattern set before enabling face recognition.
Enable both fingerprint and face recognition for the fastest experience. Face unlock gets you in instantly when you pick up the phone, and fingerprint is your backup for sunglasses, masks, or low-light situations. Your Galaxy S25 always requires a PIN or pattern every 72 hours for security — even if you use biometrics — so don’t forget it.
Locked Out? How to Regain Access
Forgot your PIN, pattern, or password? Fingerprint not working after an update? It happens more often than you’d think — especially since the Galaxy S25 forces a manual PIN/pattern entry every 72 hours regardless of biometrics. Here are every method to get back in, from least destructive to nuclear option:
If you set up Samsung Find My Mobile before getting locked out, this is by far your best option — it lets you unlock remotely without erasing anything. Go to findmymobile.samsung.com on any computer or phone, sign in with your Samsung account, select your Galaxy S25, and click “Unlock.”
If Samsung Find My Mobile wasn’t set up, Google’s alternative works too — but it requires a factory reset. Go to android.com/find, sign in with the Google account linked to your S25, select your device, and choose “Erase Device.” This removes the lock screen but also wipes all data.
If your phone is completely offline and you can’t use remote services, a hardware factory reset is your only option. This wipes everything — but gets you back in. After the reset, you’ll need your Google account credentials to pass FRP verification.
- Steps:
- Power off the phone completely
- Press and hold Volume Up + Side/Power buttons simultaneously
- Release Side/Power when Samsung logo appears, keep holding Volume Up
- In Recovery Mode: use Volume keys to navigate to “Wipe data/factory reset”
- Press Power to confirm → Select “Factory data reset”
- Select “Reboot system now” when done
If none of the above methods work, Samsung’s customer support can sometimes help — especially if you have proof of purchase and can verify ownership. They can guide you through additional recovery options specific to your situation.
After a factory reset, your Galaxy S25 will ask for the Google account credentials that were previously linked to the device. This is FRP (Factory Reset Protection) — a security feature that prevents stolen phones from being used. If you don’t remember these credentials, see Section 6 below for FRP bypass options.
Carrier Unlock (Switch Networks)
If you bought your Galaxy S25 from AT&T, T-Mobile, Verizon, or any other carrier on a payment plan, the phone is “carrier-locked” — meaning it only works with that one network. Carrier unlocking removes this restriction permanently so you can use any SIM card from any carrier worldwide.
Every US carrier is legally required to unlock your phone for free once you meet their requirements. Here’s how each unlock method works:
How to Check If Your Galaxy S25 Is Already Unlocked
Before you go through the whole unlock process, it’s worth checking if your phone is already unlocked. A lot of people don’t realize their phone was sold unlocked, or that it automatically unlocked after the payment period.
Go to Settings → About Phone and look at your model number. If it ends in “U” (like SM-S931U), it’s a carrier-branded phone. If it ends in “U1” (like SM-S931U1), it’s a factory unlocked model that works on all networks out of the box.
The most reliable test. Pop in a SIM card from a different carrier than the one you bought the phone from. If it connects and you can make calls — congrats, your phone is already unlocked. If you see an error message like “SIM not supported” or “Network locked,” you’ll need to unlock it.
On newer Samsung devices, you can check lock status directly in your settings. This is especially useful for AT&T Samsung phones released after September 2025.
Step-by-Step Carrier Unlock Process
Open your phone dialer and type *#06# — your 15-digit IMEI number will display instantly. Screenshot it or write it down. You can also find it under Settings → About Phone → IMEI.
Call your carrier or submit an unlock request online (see carrier cards below for exact numbers and links). T-Mobile users: open the Device Unlock app pre-installed on your phone → choose “Permanent Unlock.”
Once approved, insert a SIM card from a different carrier and power on. When prompted with “SIM Network Unlock PIN,” enter the code you received from your carrier. The phone will confirm “Network Unlock Successful” — and that’s it, permanently unlocked.
Carrier Unlock Policies & Phone Numbers
The simplest and cheapest way to unlock your Galaxy S25 is to ask the carrier that sold it to you. Every major US carrier is required to unlock your phone for free once you meet their requirements. Here’s exactly how to do it with each one:
AT&T Unlock
Postpaid & Prepaid Devices
Free
Submit request online or call
- Device must be fully paid off
- 60 days active on AT&T network
- No past-due balance on account
- Not reported lost or stolen
- Prepaid: 6 months of paid service
- Online portal or phone request
T-Mobile Unlock
Postpaid, Prepaid & Business
Free
Use Device Unlock App on phone
- Device fully paid off
- 40 days active on T-Mobile
- Account in good standing
- Pre-installed Device Unlock app
- Prepaid: 1 year of service OR $100+ refills
- Fastest carrier unlock process
Verizon Unlock
Postpaid & Prepaid Devices
Free
Auto-unlocks after 60 days
- Auto-unlocks 60 days after purchase
- Device must be paid in full
- No active on another account
- Not reported stolen or fraudulent
- Prepaid: device in use for 60 days
- No manual request usually needed
Sprint (Now T-Mobile)
Legacy Sprint Customers
Free
Handled through T-Mobile now
- All Sprint accounts migrated to T-Mobile
- Same 40-day active requirement
- Use Device Unlock app
- Call T-Mobile support if needed
US Cellular Unlock
Postpaid Devices
Free
Contact support directly
- Device must be paid in full
- Account in good standing
- Not reported lost or stolen
- Call customer support to request
Boost / Cricket / Metro
Prepaid MVNOs
Free
Varies by provider
- Boost: 12 months active service
- Cricket: 6 months of service
- Metro: 180 days + Device Unlock app
- Device must be fully paid off
All Unlock Methods Compared
Not sure which route to take? Here’s a quick comparison of every method available for unlocking your Galaxy S25 series phone:
| Method | Cost | Time | Difficulty | Best For |
|---|---|---|---|---|
| Carrier Request (Online/Phone) | Free | 1–5 business days | Easy | Original owner, paid-off device |
| Device Unlock App (T-Mobile/Metro) | Free | Instant – 24 hours | Very Easy | T-Mobile & Metro customers |
| Verizon Auto-Unlock | Free | Automatic (60 days) | None | Verizon customers (just wait) |
| Third-Party IMEI Unlock | $15–$45 | 15 min – 72 hours | Easy | Second-hand phones, denied carriers |
| USB Software Unlock | $20–$50 | 30–60 minutes | Moderate | Sprint/Verizon firmware-locked phones |
| Samsung Support | Free | Varies | Easy | Phones bought direct from Samsung |
If your carrier denies your request and you believe you meet all requirements, file a complaint with the FCC at fcc.gov/consumers/guides/cell-phone-unlocking. Carriers take FCC complaints seriously and usually resolve them fast. Alternatively, third-party IMEI unlock services ($15–$45) can bypass the carrier process entirely — just make sure you use reputable services that only require your IMEI, nothing else.
FRP Bypass (Google Account Lock)
Factory Reset Protection (FRP) is Google’s built-in security feature that activates after a factory reset. It requires you to enter the Google account credentials that were previously signed in on the device before you can use it again. It’s designed to make stolen phones useless — but it can also lock out legitimate owners who forgot their password or bought a second-hand phone.
FRP bypass should only be performed on devices you legally own or are authorized to service. Bypassing FRP on a stolen device is illegal. Always verify ownership with proof of purchase before attempting any bypass method.
Method 1: Google Account Recovery (Official & Safest)
The safest and most recommended approach. If you forgot the password to the Google account linked to your S25, use Google’s official recovery process to reset it. Once you have access again, simply enter the credentials on your phone’s FRP screen.
- Steps:
- On a computer, go to accounts.google.com/signin/recovery
- Enter the email address linked to the locked phone
- Click “Forgot password?” and follow verification prompts
- Reset your password using recovery phone, email, or security questions
- Return to your Galaxy S25 and enter the updated Google credentials
Method 2: Contact the Previous Owner
If you bought the phone second-hand and it’s FRP-locked, the easiest fix is contacting the previous owner and asking them to remove the device from their Google account remotely. They can do this from any computer without needing the physical phone.
- Previous owner’s steps:
- Go to my account google device activity page
- Find the Samsung Galaxy S25 in their device list
- Click the device → Select “Sign out” or “Remove”
- Alternatively: Settings → Accounts → Google → Remove Account (before the reset)
Method 3: Samsung Find My Mobile
If the Samsung account is still linked to the device, you may be able to remotely remove the lock through Samsung’s Find My Mobile service. Go to findmymobile.samsung.com, sign in, select your device, and use the available remote options. This won’t always bypass Google FRP specifically but can help with Samsung account locks.
Method 4: Recovery Mode Factory Reset (For Persistent Locks)
If you have legitimate ownership and cannot recover the Google account, a hardware factory reset through Recovery Mode will erase the device completely. Note that on Android 14+ (which the S25 ships with), FRP will still activate after the reset — so you’ll still need the Google credentials unless you use a professional FRP removal service.
- Recovery Mode:
- Power off completely
- Hold Volume Up + Side/Power simultaneously
- Release Power at Samsung logo, keep holding Volume Up
- Navigate to “Wipe data/factory reset” with Volume keys
- Confirm with Power button → “Reboot system now”
Many websites promote paid FRP bypass software. Some are legitimate, but many are scams or contain malware. The safest approach is always Google Account Recovery first. If that fails and you have proof of purchase, contact Samsung Support at 1-800-726-7864 — they can sometimes assist with FRP issues for verified owners.
Yes, absolutely. Carrier unlocking is 100% legal in the United States under the Unlocking Consumer Choice and Wireless Competition Act (2014). Every carrier is required to unlock your device for free once you meet their requirements. It doesn’t void your warranty or affect your phone in any way — it simply removes the carrier restriction.
No. Carrier unlocking does not void your warranty. It’s an officially supported process that doesn’t modify hardware or software. Samsung’s warranty remains fully intact — you’ll still receive software updates, security patches, and support as normal. Screen unlock methods like PIN/pattern changes also don’t affect the warranty.
Open your phone dialer and type *#06# — the IMEI displays immediately. You can also go to Settings → About Phone → IMEI, or check the sticker on your original retail box. The IMEI is a unique 15-digit number that identifies your specific device — you’ll need it for any carrier unlock request.
Models ending in “U” (e.g., SM-S931U) are carrier-branded phones sold by AT&T, T-Mobile, Verizon, etc. Models ending in “U1” (e.g., SM-S931U1) are factory unlocked phones sold directly by Samsung or retailers. The hardware is identical — only the firmware and pre-installed apps differ. Carrier-unlocking a “U” model doesn’t change it to “U1,” but it will work on all networks.
Yes, completely normal. Samsung requires a manual PIN, pattern, or password entry every 72 hours as an additional security measure — even if you use fingerprint or face recognition. This is a built-in Android security policy and can’t be disabled. It ensures that biometrics haven’t been compromised and that only the actual owner can access the device.
Yes — Verizon automatically unlocks all postpaid devices 60 days after purchase, as long as the phone is paid in full and the account is in good standing. No request needed. If your S25 is still locked after 60 days, call 1-800-922-0204 and ask them to push the unlock through manually.
Yes! Once carrier-unlocked, your Galaxy S25 works with any compatible SIM card worldwide. All US Galaxy S25 variants have the same hardware and support a wide range of global LTE and 5G bands. Pop in a local SIM card at your destination, or use a travel eSIM — both will work perfectly on an unlocked device.
Generally no — carriers require the device to be fully paid off before processing an unlock. Third-party IMEI services can sometimes unlock phones with a remaining balance, but your carrier can still blacklist the IMEI if payments stop. The safest approach: pay off the phone first, then request the unlock.
They’re completely different locks. A carrier lock restricts which network your phone works on (e.g., AT&T only). It’s removed by getting an unlock code from your carrier. FRP (Factory Reset Protection) is a Google security feature that asks for your Google credentials after a factory reset — it’s an anti-theft measure. You can have one without the other, or both at the same time. Carrier unlocking does NOT remove FRP, and FRP bypass does NOT carrier-unlock your phone.
Yes — once carrier-unlocked, your Galaxy S25 stays unlocked permanently. Factory resets, software updates, OneUI upgrades, and even flashing new firmware won’t re-lock it. The unlock is registered at the carrier/network level via your IMEI, so it persists no matter what changes you make to the phone’s software.
Call Samsung Support at 1-800-SAMSUNG (1-800-726-7864) or use the Samsung Members app for live chat. For carrier-related unlock issues on phones bought from Samsung.com, provide your proof of purchase and IMEI number. Samsung can verify if the device was sold unlocked and help troubleshoot network restrictions.
