Samsung Galaxy Z Flip4 5G 128GB Graphite Unlocked Renewed Smartphone SM-F721UZAAXAA

Product Overview

The Samsung Galaxy Z Flip4 identified by ASIN B0BKTWLR31 is a renewed U.S.-version foldable smartphone with 128GB of internal storage, 8GB of RAM, a Graphite finish, and unlocked cellular status. The device belongs to Samsung’s fourth-generation Galaxy Z Flip family, which was introduced in 2022 with a clamshell design that folds into a more compact shape for carrying.

When unfolded, the phone provides a 6.7-inch Dynamic AMOLED 2X main display with a 2640 × 1080 resolution and adaptive refresh rate up to 120Hz. A separate 1.9-inch Super AMOLED cover display provides access to notifications, selected controls, widgets, and camera functions while the phone remains folded.

The Galaxy Z Flip4 uses the Qualcomm Snapdragon 8+ Gen 1 mobile platform. Its camera system combines a 12MP wide rear camera, 12MP ultra-wide rear camera, and 10MP front camera. A 3,700mAh typical dual-battery system supports wired fast charging, wireless charging, and Wireless PowerShare.

Other documented capabilities include 5G, LTE, Wi-Fi 6-class connectivity, Bluetooth 5.2, NFC, Nano-SIM and eSIM support, a side-mounted fingerprint sensor, Samsung Knox security, and an IPX8 water-resistance rating. Because B0BKTWLR31 represents a renewed unit, cosmetic condition, battery health, included accessories, and refurbishment details can vary between individual devices.

Product Information

Identification

Physical

Product Identifier Summary

• Model Number: The model number distinguishes a specific hardware and regional version. It is commonly used for firmware, network compatibility, repair parts, technical support, and fitted accessories.
• MPN: The manufacturer part number identifies a manufacturer-defined commercial configuration and can distinguish storage, color, carrier, and regional versions.
• UPC: A Universal Product Code is a 12-digit barcode used by product catalogs and inventory systems. Renewed products can sometimes carry catalog identifiers that differ from the original new-device retail configuration.
• EAN: EAN is an international retail barcode format within the GTIN system. A separate EAN for the referenced renewed configuration was not included because it could not be verified without ambiguity.
• GTIN: Global Trade Item Number is the international identification framework that includes formats such as UPC and EAN. A 12-digit UPC functions as a GTIN-12.
• ASIN: B0BKTWLR31 identifies the specific referenced commercial product record and helps distinguish it from other Galaxy Z Flip4 conditions, colors, storage capacities, and configurations.
• ISBN: ISBN numbers identify books and qualifying publications and do not apply to smartphones.

Common Uses

• Voice calls and text messaging.
• 5G and LTE mobile internet access.
• Email and web browsing.
• Social and communication applications.
• Streaming video and music.
• Photography and video recording.
• Hands-free photography while the phone is partially folded.
• Video calling and conferencing.
• Navigation and location-based applications.
• Mobile gaming.
• Contactless functions through compatible NFC applications.
• Checking notifications and selected controls from the cover display.
• Wireless charging of compatible accessories through Wireless PowerShare.
• Compact storage in pockets or bags when folded.

Maintenance and Care

The foldable main display requires more careful handling than a conventional rigid smartphone screen. Avoid pressing it with fingernails, keys, pens, or other hard and pointed objects.

Do not remove the factory-designed protective layer from the folding display without following applicable Samsung service guidance. Unapproved protective films can affect display operation or place stress on the flexible panel.

Clean the exterior and displays using a soft, dry, lint-free cloth. Avoid abrasive materials, strong solvents, and excessive liquid around openings and the hinge.

Keep sand, dirt, and other small particles away from the hinge mechanism. The Galaxy Z Flip4 is water resistant under specified conditions but does not carry a certified dust-resistance rating.

Use compatible USB Type-C charging equipment and undamaged cables. Excessive heat can accelerate battery aging, which is particularly relevant when evaluating a renewed device whose previous usage history may vary.

Back up important photographs, contacts, authentication data, messages, and documents. Install supported operating-system and security updates when available for the exact device model.

Safety Information

• The Galaxy Z Flip4 contains a rechargeable lithium-ion dual-battery system that is not intended for routine user removal.
• Do not puncture, crush, burn, or intentionally disassemble the battery or phone.
• Stop using the device if the battery becomes swollen, damaged, or unusually hot.
• The Galaxy Z Flip4 has an IPX8 water-resistance rating under specified laboratory conditions.
• The IPX8 test covers submersion in up to 1.5 meters of fresh water for up to 30 minutes.
• The device is not certified as dust resistant.
• Beach and pool exposure are outside the documented IPX8 freshwater test conditions.
• Water resistance can decline through normal wear, physical damage, repair work, or deterioration of seals.
• Allow the charging connector to dry completely before connecting charging equipment if moisture is present.
• Do not place excessive pressure on the flexible main display or hinge.

Technical Specifications

Product History

Samsung announced the Galaxy Z Flip4 on August 10, 2022 as the fourth generation of its compact clamshell foldable smartphone family. General availability began later in August 2022.

The Galaxy Z Flip4 followed the Galaxy Z Flip3 5G. Samsung retained the basic clamshell layout while revising the hinge, improving power efficiency, increasing battery capacity from the previous generation, and adding faster wired charging.

The device also introduced Qualcomm’s Snapdragon 8+ Gen 1 platform to the Galaxy Z Flip family. Original storage configurations included 128GB, 256GB, and 512GB, with 8GB of RAM.

Graphite was one of the standard Galaxy Z Flip4 colors. Other original colors included Bora Purple, Pink Gold, and Blue, while additional combinations were available through the Bespoke Edition program.

The Galaxy Z Flip5 succeeded the Galaxy Z Flip4 in 2023. One of the most visible changes on the successor was a substantially larger external cover display.

Key Features

• Compact clamshell folding design.
• 6.7-inch Dynamic AMOLED 2X foldable main display.
• Adaptive main-display refresh rate up to 120Hz.
• 1.9-inch Super AMOLED cover display.
• Snapdragon 8+ Gen 1 mobile platform.
• 8GB RAM.
• 128GB internal storage.
• 12MP wide rear camera with optical image stabilization.
• 12MP ultra-wide rear camera.
• 10MP front camera.
• Flex Mode operation when partially folded.
• 3,700mAh typical dual battery.
• 25W-class Super Fast Charging support.
• Fast Wireless Charging 2.0.
• Wireless PowerShare.
• 5G cellular connectivity.
• Nano-SIM and eSIM support.
• Bluetooth 5.2.
• NFC support.
• USB Type-C connectivity.
• Side-mounted fingerprint recognition.
• Samsung Knox and Knox Vault security.
• IPX8 water resistance.
• Armor Aluminum frame.
• Gorilla Glass Victus+ exterior glass.

Package Contents

B0BKTWLR31 identifies a renewed device rather than a factory-new retail package. Exact accessories and packaging can therefore depend on the refurbisher and individual unit.

The phone itself is the consistently identified component. A charging cable, SIM-ejection tool, power adapter, documentation, or replacement packaging should not be assumed unless specifically documented for the individual renewed unit.

Compatibility

The referenced Galaxy Z Flip4 is identified as an unlocked U.S.-version device. Unlocked status does not guarantee activation on every carrier because cellular compatibility also depends on network frequencies, carrier certification, account provisioning, and the device’s IMEI status.

The model belongs to Samsung’s SM-F721U1 unlocked U.S. family. This model designation is useful when checking network service, firmware, cases, screen protectors, repair parts, and technical documentation.

The phone supports a physical Nano-SIM and eSIM. Actual eSIM activation depends on software version and wireless-carrier support.

The Galaxy Z Flip4 does not provide a microSD card slot. The 128GB internal storage configuration therefore cannot be expanded with a conventional removable memory card.

USB Type-C is used for compatible wired charging and data connections. Wireless charging requires compatible WPC equipment.

Cases should specifically identify compatibility with the Galaxy Z Flip4. Cases for the Galaxy Z Flip3, Flip5, or later Flip generations should not be assumed to align with the hinge, cameras, buttons, and body dimensions.

Frequently Asked Questions

What product does B0BKTWLR31 identify?

B0BKTWLR31 identifies a renewed U.S.-version Samsung Galaxy Z Flip4 5G with 128GB of storage, a Graphite finish, and unlocked cellular status.

Is B0BKTWLR31 a new or renewed phone?

The referenced configuration is identified as renewed. It should therefore be distinguished from Samsung’s original factory-new Galaxy Z Flip4 retail configuration.

What does renewed mean for this product?

Renewed indicates that the device has previously entered the product lifecycle and has been prepared for resale. Cosmetic condition, battery condition, packaging, accessories, and refurbishment procedures can vary by supplier.

What model family is the U.S. unlocked Galaxy Z Flip4?

The U.S. factory-unlocked Galaxy Z Flip4 belongs to the SM-F721U1 model family. Exact software and regulatory information can be confirmed through the device settings.

How can I confirm the exact model on the phone?

The model number can be found through the device’s software settings and applicable regulatory labels. The IMEI can also be used when checking network eligibility and device history.

Does the Galaxy Z Flip4 work while folded?

Yes. The external cover screen supports selected notifications, widgets, controls, camera functions, and other compatible interactions without fully unfolding the phone.

What is Flex Mode?

Flex Mode refers to supported operation while the phone is partially folded. Compatible applications can arrange controls and content around the upper and lower portions of the display.

Can the Galaxy Z Flip4 stand by itself while taking pictures?

The hinge allows the phone to remain partially folded at supported angles. This can provide a stable position for certain hands-free camera and video functions.

Does the main display operate at 120Hz?

Yes. The main Dynamic AMOLED 2X display supports an adaptive refresh rate of up to 120Hz. The actual refresh rate changes according to supported content and system behavior.

Does it have a second screen?

Yes. A separate 1.9-inch Super AMOLED cover display is located on the exterior of the folded device.

Can the cover screen replace the main display?

No. The cover screen is primarily intended for compact interactions, widgets, notifications, camera previews, and selected controls rather than full-size application use.

How many cameras does the Galaxy Z Flip4 have?

The device has two rear cameras and one front-facing camera. The rear system provides wide-angle and ultra-wide functions.

Can the rear cameras be used for selfies?

Supported camera functions can use the cover display as a preview while the rear cameras capture the image. This allows the higher-resolution rear cameras to be used for certain self-portraits.

Does the Galaxy Z Flip4 have optical image stabilization?

Yes. The 12MP wide rear camera includes optical image stabilization.

Can the storage be expanded with a microSD card?

No. The Galaxy Z Flip4 does not have a microSD card slot.

How much RAM does this configuration have?

The 128GB Galaxy Z Flip4 configuration includes 8GB of RAM.

Does the Galaxy Z Flip4 support 5G?

Yes. The phone supports 5G cellular service in addition to LTE, subject to compatible network coverage and carrier provisioning.

Is the referenced model unlocked?

Yes. The referenced renewed configuration is identified as unlocked. Carrier compatibility should still be confirmed before activation.

Does the Galaxy Z Flip4 support eSIM?

Yes. Samsung documents eSIM support for compatible Galaxy Z Flip4 configurations. Activation availability depends on software, region, and carrier support.

Does the Galaxy Z Flip4 support wireless charging?

Yes. Samsung documents Fast Wireless Charging 2.0 support with compatible equipment.

What is Wireless PowerShare?

Wireless PowerShare allows the phone to supply wireless power to compatible Qi-enabled devices and accessories placed against its rear surface.

Does the Galaxy Z Flip4 support fast wired charging?

Yes. Samsung documents Super Fast Charging using compatible 25W charging equipment or higher.

Is a wall charger guaranteed with B0BKTWLR31?

No. Because this is a renewed product, accessory contents can vary. A wall power adapter should not be assumed unless it is specifically documented with the individual unit.

Is the Galaxy Z Flip4 waterproof?

The phone has an IPX8 water-resistance rating rather than a permanent waterproof guarantee. Samsung’s rating is based on specified freshwater laboratory test conditions.

Is it dust resistant?

No certified dust-resistance rating is specified. Small particles such as sand and dirt should be kept away from the hinge and folding display.

Should the folding screen protector be removed?

The protective layer on the flexible main display should not be treated like an ordinary removable screen protector. Service or replacement should follow applicable manufacturer guidance.

Does the phone have a headphone jack?

No conventional 3.5 mm headphone jack is provided. Audio accessories can use supported Bluetooth or compatible USB Type-C connections.

What operating system originally shipped with the Galaxy Z Flip4?

The Galaxy Z Flip4 originally launched with Android 12 and Samsung One UI 4.1.1. A used or renewed unit may already have a later supported software version installed.

How should a renewed Galaxy Z Flip4 be checked after receiving it?

Useful checks include the exact model number, IMEI status, charging operation, battery behavior, cameras, speakers, microphones, wireless connections, fingerprint sensor, hinge movement, main display, cover display, and flexible-screen protective layer.

Does the original Samsung warranty automatically apply to a renewed unit?

Warranty coverage should not be assumed from the original model specification. Renewed-device warranty terms depend on the refurbisher, seller, service provider, and documentation associated with the specific unit.

Buying Considerations

• Confirm that the device is the U.S. SM-F721U1 family when U.S. carrier compatibility is important.
• Check the IMEI with the intended carrier before activation when possible.
• Verify that the device is not subject to an activation lock, outstanding account restriction, or network blacklist.
• Remember that B0BKTWLR31 identifies a renewed device.
• Renewed units can differ in cosmetic condition and previous usage history.
• Battery health can vary between renewed units even when the original battery specification is identical.
• Inspect the hinge for smooth operation and correct alignment.
• Inspect the main foldable display for abnormal pixels, lifting protective film, touch problems, or damage near the crease.
• Check the cover display and both rear cameras.
• Confirm that wired and wireless charging operate correctly.
• Verify the exact accessories included with the individual renewed unit.
• The 128GB internal storage cannot be expanded with microSD.
• The phone has no conventional 3.5 mm headphone connector.
• The IPX8 rating does not provide certified dust resistance.
• The folding display requires more careful handling than a conventional rigid smartphone screen.
• Cases and fitted accessories should be designed specifically for the Galaxy Z Flip4.

Customer Feedback Summary

This section summarizes recurring themes in publicly available owner discussions and independent evaluations. These observations are generalized feedback rather than verified specifications, and individual renewed units can produce different experiences.

The folding form factor is commonly described as the Galaxy Z Flip4’s main practical distinction. Users often appreciate that a full-size smartphone display folds into a shorter shape that takes up less vertical space in a pocket or bag.

The main AMOLED display and adaptive refresh rate also receive recurring positive comments. Scrolling and supported animations are generally described as smooth, while the tall display provides substantial viewing space once the phone is unfolded.

Flex Mode is another frequently discussed feature. Owners use the partially folded position for photography, video calls, media controls, and situations where a separate phone stand would otherwise be useful.

Battery feedback is mixed. The 3,700mAh battery represented an improvement over the previous Flip generation, but intensive camera use, gaming, navigation, mobile data, and high display activity can still reduce runtime substantially.

The 1.9-inch cover screen is often considered useful for quick information and camera previews, but its small size limits interaction compared with the much larger external displays introduced on later Flip models.

Long-term feedback about foldable devices frequently emphasizes hinge condition, the display crease, and the main-screen protective layer. These components require additional attention compared with conventional rigid-screen phones.

For renewed Galaxy Z Flip4 units, customer experiences can vary more widely because battery wear, cosmetic condition, previous repairs, accessory inclusion, and refurbishment quality depend on the individual device and refurbishment process.

Related Products

• Samsung Galaxy Z Flip3 5G: Previous generation in Samsung’s compact clamshell foldable family.
• Samsung Galaxy Z Flip5: Direct successor with a substantially larger external cover display.
• Samsung Galaxy Z Flip4 256GB: Higher-storage version of the same generation.
• Samsung Galaxy Z Flip4 512GB: Highest standard internal-storage configuration of the Galaxy Z Flip4.
• Samsung Galaxy Z Fold4: Larger book-style foldable introduced alongside the Galaxy Z Flip4.
• Samsung Galaxy Buds2 Pro: Wireless earbuds introduced during the same Galaxy foldable generation.
• Galaxy Z Flip4 Silicone Cover with Strap: Model-specific protective accessory.
• Galaxy Z Flip4 Silicone Cover with Ring: Model-specific protective accessory with a carrying ring.
• Compatible USB Type-C charging equipment: Used for wired charging and supported data connections.
• Compatible Qi wireless chargers: Used with the phone’s supported wireless charging function.

Last Updated

August 7, 2026