Sell Galaxy S21 Ultra 5G | Trade in Your Galaxy S21 Ultra 5G for Cash | GadgetGone
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Trade In Galaxy S21 Ultra 5G For Cash

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How to Sell Your Galaxy S21 Ultra 5G With GadgetGone

How It Works

Selling to GadgetGone is a simple, 3-step process that turns your used cell phone into cash in as little as 2 days. The best part? We have the highest trade-in values around for your old Galaxy S21 Ultra 5G, guaranteed—no matter the condition, quantity, or carrier.


Unlike other selling platforms or using your carrier’s trade-in program, we have multiple payment options. We’re talking cold, hard cash—no gift cards here (unless you want one, of course). Get your quote today to get started!


Get Your Quote

Just fill out our simple form

Select your cell phone model, answer a few questions, and get an obligation-free offer instantly.


Ship Your Cell Phone

Signed, sealed, delivered

Box up your used Galaxy S21 Ultra 5G and ship it to us for free with our prepaid shipping label.


Get Paid Quick

Put money in your pocket

Choose between a mailed check, Amazon gift card, or PayPal payment. Once your cell phone is delivered, we’ll make sure you get paid ASAP.

Fast. Efficient. Profitable.

Why Use GadgetGone?

Get the Most Money Fast

Get the most money for your old Galaxy S21 Ultra 5G when you sell with GadgetGone. With our PriceMatch+ Guarantee, we’ll beat any quote offered by one of our approved competitors. Once we’ve received your phone, your cash will be on its way to you in as little as two days by PayPal, Amazon gift card, or mailed check.

Save Time and Energy

Want to sell your used Galaxy S21 Ultra 5G quickly? Skip the hassle of selling your old phone in person, dealing with non-paying eBay bidders, meeting up with low-balling local strangers, and getting pennies on the dollar from big-box stores by selling to GadgetGone. Get your guaranteed quote in seconds, then send your cell phone to us for free with our shipping kit and prepaid mailing label.

Receive Unmatched Customer Service

From helpful tips for first-time sellers to reminder texts for busy customers and answers to every question in between, our Customer Relationship Specialists make getting paid a breeze. Whatever you need, one of our customer-experience rock stars is only a text away.

Sell Cell Phones in Any Condition

GadgetGone offers the best price for your old phone, no matter which carrier you use or the condition it’s in. New, gently used, damaged, cracked, or just plain broken: if you’ve got it, we’ll buy it.

Start Trade-in

Frequently Asked Questions

How do I know what my Galaxy S21 Ultra 5G is worth?

We want you to be happy with your offer from GadgetGone. So before selling your Galaxy S21 Ultra 5G, it’s a good idea to get multiple price quotes to make sure you’re getting the best trade-in value for resale. Aside from getting your instant GadgetGone offer, a great way to assess the potential value of your used phone is by taking a look at your phone carrier’s trade-in program.

You can also look at other popular buyback programs like EcoATM or Apple Trade In to get an idea of what your Samsung Galaxy S21 Ultra 5G is worth. If you find a better price from any of these companies, GadgetGone will beat it with our PriceMatch+ Guarantee. Just message us to let us know the company you’d like to price match.

Remember that condition is very important when it comes to cell phone values—you’ll always get more money for a phone in excellent or good condition.

Can I sell my old Galaxy S21 Ultra 5G even if it’s broken?

Yes! GadgetGone accepts phones in a variety of different conditions, from brand-new to broken. We’re the best place to sell your broken cell phone because unlike other trade-in sites, we’ll pay you a fair price.

Have a phone with a cracked or damaged screen (or even cracked backglass) that works perfectly otherwise? Don’t settle for lackluster offers from one of our competitors. Select our special “cracked” condition category and get paid more than with any other buyback program. You can even sell old cell phones that are water damaged or won’t turn on. No matter the issue, you’ll always get the most cash by trading in your cracked or broken phone with GadgetGone.

Can I sell a locked cell phone?

That depends on what you mean by “locked.” While you can sell your carrier-locked phone to GadgetGone, we do not accept used cell phones that have been reported as lost or stolen. You can trade in a phone that is still being financed to GadgetGone as well. Just make sure you select the “broken” condition category when getting your instant quote.

Can I sell more than one cell phone?

Definitely! Heck, you can sell devices of all kinds to GadgetGone, not just cell phones. Whether you have multiple phones of the same model or a bunch of different models, you can add any quantity necessary to your cart when getting your initial quote. We even accept bulk trade-ins from wholesale sellers or companies looking for IT asset recovery.

Does it matter who my carrier is?

Not at all! GadgetGone offers instant quotes for cell phones from major carriers like AT&T, Verizon, T-Mobile, and Sprint (and of course you can sell unlocked phones, as well). If you need to sell used cell phones from a lesser-known network carrier (like Xfinity, Cricket, Straight Talk, Tracfone, US Cellular, or others) just contact us for a custom quote.

Do I have to sell my cell phone after I get a quote?

Nope! All of our quotes are obligation-free. You don’t have to ship your phone unless you’re happy with the amount we’ve offered. And if for some reason you change your mind after sending it in, we’ll mail your used cell phone back to you for free—no questions asked.

How long do I have to ship my old cell phone?

Your quote is locked in for 14 days from the time you check out on our website. As long as the USPS tracking number shows you shipped your cell phone within those 14 days, your offer amount is guaranteed.

You can still ship your phone after the 14-day price-lock period (some of our customers wait 30 days or more); however, your phone will be subject to whatever our current pricing is at the time of evaluation. Earlier is always better, but feel free to ship your cell phone whenever you’re ready to sell!

What do I need to do before selling my Android phone?

Unsure of how to prepare your old Android phone for selling? Just follow these easy steps:

1.  Back up your cell phone. Chances are that your Android phone is already set up to back up your phone’s data automatically using your Google account. However, it’s a good idea to back it up one final time before you sell it. Do this by going to Settings > System > Backup > Back up now > Continue. If you have a Samsung phone, back it up by going to Settings > Accounts and backup > Backup and restore > Google Account > Back up now.

2.  Turn off Factory Reset Protection by going to Settings > Accounts/Accounts and backup > Accounts > find and tap on your Google account(s) that is tied to your phone > Remove account.

3.  Factory reset your phone by going to Settings > System > Reset options > Erase all data (factory reset) > Reset phone > enter your device’s passcode if necessary and select Continue > Erase everything. If you have a Samsung phone, factory reset it by going to Settings > General management > Reset > Factory data reset > Reset > enter your device’s passcode and select Next > Delete all.

4.  Make sure your cell phone has been paid off and removed from your carrier account if necessary.

5.  Fully charge your phone, then turn it off.

6.  Remove your SIM and SD cards if you’d like to keep them for another device.



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I'm happy I chose GadgetGone!

I’m happy I chose GadgetGone. I received a more-than-fair quote immediately and I didn’t wait long at all to receive my payment. Customer service was friendly and quick with their responses.

- Jenn

Paid exactly what they said I would be.

Excellent communication during the process and was paid exactly what they said I would be (which was even more than I expected for it). Very friendly through email and will respond in a timely manner. I definitely recommend them to anyone who has old phones lying around!

- Michael K.

GadgetGone offered the best rate by far!

I researched all of the different vendors to sell my used iPhone 6+ and GadgetGone offered the best rate by far. The process was quick and simple and I received my cash very quickly. I would definitely use them again in the future.

- Keith A.

Super simple and easy.

Super simple and easy way to get rid of an old phone and make extra money. Definitely a good choice!

- Stephanie F.

Definitely using their services again.

GadgetGone representatives responded to my request in a timely and appropriate manner. My quote was higher than on any other site and payment was fast and hassle-free. I would definitely use their services again.

- Simona R.
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