Samsung · Instant quote

Samsung Galaxy Z Flip4

Carrier:

Storage:

Cosmetic Condition:

Functionality:

Accessories included?

The Samsung Galaxy Z Flip4 launched in 2022 as Samsung's third-generation clamshell foldable, built for buyers who wanted a compact phone in the pocket and a full-size display when opened. It sold under model numbers SM-F721U1 and F721U on US carriers, with SM-F721W covering Canadian units. Two years on, it still holds value because the Snapdragon 8+ Gen 1 platform remains capable, the hinge design proved more durable than earlier Z Flip generations, and foldables in general have a smaller secondhand supply than slab phones, which keeps demand steady. Whether yours still folds flat and boots up, or the cover screen is cracked and the battery barely holds a charge, condition and configuration decide the number. Pick your carrier, storage and condition in the picker above for an instant cash offer, or see how the process works before you commit. If you'd rather browse other options first, you can sell your smartphone from the same page.

Confirm you have the Galaxy Z Flip4

Open the phone and go to Settings → About phone → Model number. That string, along with the storage figure under Settings → About phone → Storage, tells you exactly which variant you're holding. If the screen won't turn on, the model number is also printed in small text on the SIM tray slot.

SM-F721U1

  • US carrier-locked or unlocked unit
  • Sold through AT&T, T-Mobile, Verizon and Samsung direct
  • Most common variant in the US secondhand market

F721U

  • US unlocked retail variant
  • Same hardware as SM-F721U1, different firmware branding

SM-F721W

  • Canadian carrier and retail variant
  • Check for Canadian carrier branding on the cover screen or SIM tray

Prefer a visual check? The Z Flip4 has a slightly larger 1.9-inch cover screen than the Z Flip3's 1.9-inch panel positioned differently, a matte-finish Armor Aluminum frame, and a camera bump with two lenses stacked vertically next to the cover display. The hinge sits flush with almost no gap when closed.

Core hardware configurations

Processor

  • Qualcomm Snapdragon 8+ Gen 1
  • Same chip across every carrier and storage variant

Memory (RAM)

  • 8GB, soldered and not upgradable

Storage

  • 128GB or 256GB UFS 3.1, soldered, no microSD slot
  • 256GB units command the stronger resale price

Cameras

  • Dual rear: 12MP wide plus 12MP ultrawide
  • 10MP under-display front camera, plus rear cameras double as a high-res selfie setup using the cover screen as a viewfinder

Display & audio

Main display is a 6.7-inch foldable Dynamic AMOLED 2X with adaptive 120Hz refresh, running full HD+ resolution. The factory screen protector is part of the panel assembly and should never be peeled off.

Cover screen is a 1.9-inch Super AMOLED panel for notifications, widgets and camera preview without opening the phone.

Stereo speakers tuned by AKG. No 3.5mm headphone jack.

Security is handled by a side-mounted fingerprint reader built into the power button. No under-display fingerprint sensor and no dedicated face-unlock hardware, though camera-based face recognition is available as a software option.

Ports & connectivity

A single USB-C port handles charging and wired data on this device; there is no headphone jack and no expandable storage.

Wired
  • USB-C 2.0
  • SIM tray (nano-SIM plus eSIM support, varies by carrier)
Wireless
  • 5G sub-6GHz (mmWave on select US carrier variants)
  • Wi-Fi 6
  • Bluetooth 5.2
  • NFC for contactless payment

Foldable AMOLED Snapdragon 8+ Gen 1 120Hz adaptive IPX8 water resistant 5G Wireless charging Side fingerprint

Battery, build & more

Battery is a 3,700mAh dual-cell pack split across both halves of the hinge, supporting wired fast charging and Qi wireless charging.

Frame is Armor Aluminum with Corning Gorilla Glass Victus+ on front and back. Rated IPX8 for water resistance but not dust resistant, which matters for buyback grading if the hinge has visible debris.

Retail colors include Bora Purple, Graphite, Pink Gold and Blue, with additional Bespoke Edition color combinations sold direct from Samsung.

Known issues center on hinge crease visibility over time and gradual battery capacity loss typical of any phone this age. Neither disqualifies a working unit from a cash offer, but both affect the condition grade.

Frequently asked questions

01 How do I find the model number and exact configuration?
Go to Settings → About phone → Model number, which will read SM-F721U1, F721U, or SM-F721W depending on your carrier and region. Storage capacity is listed just below it under Settings → About phone → Storage. If the device won't power on, the model number is printed in tiny text on the SIM tray itself, and you can pull it out with a SIM eject tool to check. Carrier can also usually be confirmed by the branding shown on the cover screen at boot.
02 How do I tell it apart from the Galaxy Z Flip3?
The fastest way is Settings → About phone → Model number, since the Flip3 uses SM-F711 series numbers versus the Flip4's SM-F721 series. Visually the two are close: the Flip4 has a slightly revised camera bump and a marginally larger battery, but the hinge and cover screen look almost identical at a glance. If the phone won't turn on, check the box or the sticker under the original SIM tray, which usually lists the full model number even when the device itself is dead.
03 Can I sell it with damage, a cracked screen, weak battery, or if it won't turn on?
Yes. Cracked inner or cover screens, hinge wear, a battery that drains fast, and units that won't power on are all accepted, and the condition picker above adjusts the quote to match. What matters most before shipping is removing any Google account and, if Samsung's Find My Mobile lock or Google's Factory Reset Protection is still active, clearing it first. A device that's still locked to a previous owner's account can't be resold and typically can't be paid out until that's resolved.
04 What raises the trade-in value the most?
A fully functional hinge and an unmarked cover screen matter more than almost anything else on a foldable, since both are expensive to repair and directly affect resale. Beyond that, higher storage capacity, an unlocked carrier status, original box and charger, and a clean battery health reading all push the offer up. Removing your Google account and any screen lock before you start the quote process also keeps things moving without delay.
05 How do I erase it, remove my accounts, and get paid?
Go to Settings → General management → Reset → Factory data reset, then confirm. Before that, remove your Google account under Settings → Accounts and backup → Manage accounts, and make sure Find My Mobile and any screen lock are turned off so the next owner isn't blocked by Factory Reset Protection. Once the reset finishes and the phone reboots to the setup screen, it's ready to ship. Shipping is free and insured, and payment goes out after testing by PayPal, Venmo, Zelle, CashApp or check. Full steps, including how FRP works, are covered in our data erasure protocols.