5.0· 4 verified reviews on ResellerRatings

Sell Your Used Galaxy S21 Ultra for Up to $126

Get the best value for your Galaxy S21 Ultra. Free shipping, fast inspection, and payment within 3 business days. No hidden fees.

Getting a cash offer for your Galaxy S21 Ultra takes only minutes, with top payouts reaching $126. An unlocked unit in Excellent condition across its 128GB to 512GB storage options earns the top payout, while worn handsets still bring a fair cash quote graded down to Poor. Every device gets a Certified Data Wipe at an R2 facility.

14-Day Price Lock

Ship within 14 days. Even if the market drops, your payout stays the same.

Free Insured Shipping

Prepaid USPS label, and you're covered if it's lost in transit.

Paid in 3 Business Days

Your payout is sent within 3 business days after we receive your device.

Data Wiped Securely

Every device is factory reset and wiped using industry-standard methods before resale.

Your locked-in payout

$98

Your trade-in

Galaxy S21 Ultra

Prices updated

Select Storage

Select Carrier

Select Condition

Start My Trade-In · $98✓No account needed · Takes 60 seconds

Up to $25 extra

Fast-Ship Bonus

Ship within 24 hours of accepting your offer and earn up to $25 more per eligible device — on top of your payout.

Locked for 14 days

14-Day Price Lock

Your quoted price is held for 14 days — ship anytime in that window and get exactly what we quoted, even if prices drop.

What our customers say

5.0·4 verified reviews on ResellerRatings

Jul 28, 2026

Highly recommended!

The company is new so I hesitated at first but the offer was good so I took a chance and had a wonderful experience with gadgetrenu , good communications and fast payment. Would recommend!

Steve G. · Hoboken, NJVerified

Aug 11, 2026

Everything was perfect

Very transparent process. They informed me of the status and progress of my order throughout the whole process from end to end. Sale went exactly as described, flawlesssss

Debbie H. · TennesseeVerified

Aug 17, 2026

good experience

I sold gadgetrenu an expensive iPhone 17. Their offer was very fair and the process was simple and fast. Much better than the poor experience I had with backmarket trying to sell them the same iPhone. I will use gadgetrenu again for sure!

Stacey L. · United StatesVerified

Aug 19, 2026

honest fast reliable

great experience! they were super responsive and helped me get everyting submitted. once they recieved my item they told me it was worth more than i thought and actually paid me an extra $50. They could have easily kept quiet, but they were completly honest. I couldn’t be happier and will definately recommend them!

Jose S. · New MexicoVerified

Simple process

How Selling Your Galaxy S21 Ultra Works

Get Your Quote

Tell us the model, storage, and condition. Get an instant offer — no haggling, no lowballs.

Ship It Free

We send you a prepaid USPS label. Drop it off or scan the QR code at any USPS location. No printer needed.

Get Paid Fast

Once we receive and inspect your device, payment is sent within 3 business days after delivery via PayPal, Zelle, Venmo, Cash App, or check.

Certified Processing

14 Days

Price Lock

3 Business Days

After Delivery

100%

Data Securely Wiped

Galaxy S21 Ultra Buyback Prices by Condition

Storage	Excellent	Very Good	Average	Fair	Poor
128GB	$98	$83	$76	$51	$16
256GB	$112	$93	$86	$59	$18
512GB	$126	$106	$91	$62	$20

Maximum payout per configuration. Unlocked devices shown. Actual offer depends on carrier and detailed condition.

What condition is your Galaxy S21 Ultra?

Grade it honestly and your quote matches your payout — no surprises.

Excellent

Like new. No scratches, fully working, healthy battery.

Very Good

Minor wear, no scratches visible at arm’s length.

Average

Visible scratches or scuffs but fully functional.

Fair

Noticeable cosmetic damage, still powers on and works.

Poor

Cracked screen, water damage, or won’t turn on.

Get paid your way

Real cash — never store credit.

PayPalZelleVenmoCash AppCheck

Before you sell

Remove all personal data and disable iCloud or account locks before shipping.
Your payout is processed after device verification by our team.
Final offer may vary if the actual condition differs from your submission.
Cancel anytime before shipping — no obligation until you send your device.

Other Galaxy S21 Models

Sell Galaxy S21Up to $66

Sell Galaxy S21 FEUp to $47

Sell Galaxy S21+Up to $83

Learn More About Selling Your Galaxy S21 Ultra

Samsung Galaxy Trade-In Value Guide 2026

What every Galaxy model is worth right now.

Sell Phone on eBay vs. Buyback Service

Real math on fees, time, and risk.

Common questions

Frequently Asked Questions About Selling Your Galaxy S21 Ultra

Your Galaxy S21 Ultra is worth between $11 and $126 depending on storage size and condition. Get an exact quote in 60 seconds — no commitment required.

We recommend signing out of your Google account and doing a factory reset before shipping. If you forget, our team will securely wipe all data during inspection using industry-standard methods.

We buy broken devices too! Cracked screen, water damage, or won't turn on — we'll still make you an offer. Select "Poor" condition when getting your quote.

After accepting your quote, we email you a free prepaid USPS shipping label and a QR code. Show the QR code at any USPS location — no printer needed. Just drop it off and you're done.

Once we receive and inspect your device, payment is sent within 3 business days after delivery. Choose PayPal, Zelle, Venmo, Cash App, or check — whatever works best for you.

If your device's condition doesn't match what was selected, we'll send you a revised offer. You can accept the new offer or have your device shipped back to you for free.

Ready to sell your Galaxy S21 Ultra?

Get your instant quote now. Free shipping, fast payment, no hassle.

Start My Trade-In

✓ Payout sent within 3 business days after approval✓ Cancel anytime before shipping✓ 14-day price guarantee included

Start My Trade-In · Up to $126