Unless you purchased a Samsung cellphone that was specifically described as unlocked, your phone is probably locked, which means it is tied to a specific carrier's cellular service. To use that phone with another carrier, you need to unlock it. You can ask your current service provider to unlock the phone for you. Assuming you don't have a contract or have paid an early termination fee and have paid for the phone itself, your carrier may unlock it in-store or unlock it remotely. If your carrier won't unlock the phone for some reason, you can try to unlock it yourself using one of the free unlocking services available on the internet.

• Free Samsung Master Unlock Codes
• Free At T Unlock Codes Samsung Lock Screen
• Free Cell Phone Unlock Codes
• Free At&t Unlock Codes V551

Free unlocking for all Samsung models on AT&T network. Unlocks all models, even the latest ones if SIM is listed as clean. For other networks, the Samsung service will unlock your mobile device at very low price. Receive code via in-app notification. You will get notified in your app as soon as you code is available.

Free Samsung Unlocking Software and Codes

Free Samsung Master Unlock Codes

Listed here are software programs and unlock code services designed to help you unlock your Samsung phone.

Although this information is written specifically about Samsung phones, you may find that it applies to other Android phones also, including Google, Huawei, Xiaomi, LG, etc.

Free At T Unlock Codes Samsung Lock Screen

You'll need to know your Samsung phone's model number for most of these unlocking tools. It is usually located behind the battery, so you'll need to remove the battery to see it.

• WorldUnlock Codes Calculator — This small Windows software program generates unlock codes for many of the cell phones from major manufacturers including Samsung. After you download it and input your phone's details, including the model, manufacturer, location, and IMEI number, the unlock code calculator generates a code. The code must be entered while your phone does not have its SIM card installed.
• UnlockSamsungOnline — There are highly detailed instructions on this site that explain how to unlock your Samsung phone using a program called SRS.
• Free SIM Unlock Samsung Online — is an online service that generates a code you use to unlock your Samsung phone.
• Universal Simlock Remover — This third-party software is designed to unlock a variety of mobile phones including Samsung phones.
• FreeUnlocks — You can either pay for the unlock from this website or get it free through TrialPay.

Be Cautious When You Unlock

Unlocking your phone yourself can be a risky business because doing so may void any warranty you have, and the process can irreparably harm your phone. However, in most countries, including the U.S., it's completely legal.

Plenty of people are interested in unlocking their cellphones. If it works, unlocking your phone gives you more freedom in how and where you use it. You may be able to make cheaper calls, install new software, and do more with your phone. After you unlock your phone, though, it may not work with all carriers. Technologies differ among cell service providers, and your phone's technology must be compatible with the provider you plan to use.

Even when the phone works with a different carrier, some of the features may not work as they did previously.

Carrier Compatibility

The two network standards in the U.S. are Global System for Mobile Communications (GSM) and Code Division Multiple Access (CDMA). There are a few GSM/CMDA hybrid phones available, and it looks like most carriers will switch over to GSM. GSM phones have SIM card slots, and Long Term Evolution (LTE) is a GSM standard. Any phone or tablet with LTE must have a SIM card slot.

The moral of this story is that compatibility matters. Contact any cellular provider you are considering before you unlock your phone to make sure that your phone will be compatible with the company's service after you unlock it.

Alternatives to Free Unlocking Codes for Your Smartphone

Buying an unlocked phone is a safer, but more expensive alternative to unlocking a phone yourself.

You can also purchase unlocking software that might work when the free software doesn't, but make sure you research it thoroughly so that you don't throw away your money. Here are a few services to check out:

• UnlockBase — claims to have unlock codes for more than 3,000 Samsung smartphone models. They aren't free, but you can't beat the selection.
• Dr.fone toolkit — a paid service that offers a free trial you may find useful.
• CellUnlocker.net — covers a wide range of Samsung model unlock codes.

You can also try the web-based unlock tool at SamMobile.com as a substitute for a software-based solution. Give the site a few details about your handset, and it emails you the appropriate unlock code. Even though it's not free, it has a high success rate at unlocking Samsung smartphones.

Part 5. SIM Unlock Samsung Phone Within 10 minutes Using dr.fone

Although SIM unlocking your Samsung phone using unlock code is simple, but it's not easy to find a safe free unlocking code to unlock your phone successfully. Here we would like to introduce you dr.fone - Android SIM Unlock, which can support to unlock Samsung phones within 10 minutes. The best part is it does not require any technical skills and no risk to your phone data at all.

dr.fone - Android SIM Unlock

The fastest way to unlock your phone.

• Simple process, permanent results.
• Supports over 400 devices.
• Operates in over 60 countries.
• No risk to your phone or data.

How to SIM Unlock Samsung Phone with Android SIM Unlock

Firstly download and install dr.fone - Android SIM Unlock on your computer. Launch the program and select Android SIM Unlock from More Tools section.

Free Cell Phone Unlock Codes

If your phone is Samsung S3~ S7, after you connect the phone to the computer, Android SIM Unlock will recognize it automatically. You just need to click on Unlock to confirm the operation. The program will unlock your phone automatically. But for these devices, the program will require root access.

For Samsung S2~S4, Note 1~Note 3 series, the program does not require root access to SIM unlock the phone. Just connect the phone to computer using a USB cable. Once the device is recognized, click on Next to continue.

Then follow the instruction on the program to set the device in USB Settings / Diagnostic / Service Mode. For different phones, you need to dial *#0808# or ##3424# or #9090# on the keypad. Normally one of these will work for your phone. Then the phone will enter USB Settings / Diagnostic / Service Mode. Then select DM + MODEM + ADB or UART[*] or CDMA MODEM on the phone.

Free At&t Unlock Codes V551

After the phone enters USB Settings / Diagnostic / Service Mode, just click on Unlock on the program to SIM unlock your Samsung phone.