The quickest way to verify your Samsung model is to locate it in your phone’s settings menu.

On your phone, browse to Settings > About Phone to view your:

• Model name
• Model number
• Serial number
• IMEI number
• Hardware version

You can also access your phone details by using these steps:

• Open the Phone app
• Dial *#06# on the keypad
• Details about your devices IMEI and serial number will automatically appear on the screen

If your Samsung does not power on, check to see if the model number is printed on the back of the device.

You can identify your Samsung Galaxy A21 Ultra carrier in the settings menu.

Browse to Settings > About Phone > Status > Network or Service Provider

* If your Samsung Galaxy A21 Ultra doesn’t power on, your carrier name or logo might also be imprinted on the SIM card.

If your carrier is not listed, please select “Other”.

All carriers aside from Verizon, T-Mobile, and AT&T fall under the “Other” classification.

If you are currently using a carrier other than the network it was originally locked to, you’ll need to select the original carrier when entering the details for your phone.

For example, if you purchased your phone from AT&T but then switched to another carrier such as Verizon, you’ll need to select “AT&T” for your device details so that you receive an accurate buyback quote.

To find your Samsung Galaxy A21 storage capacity navigate to:

Settings > About Phone > Storage

Use the following condition descriptions to determine the best match for your Samsung Galaxy A21

* Please note that each store has a slightly different way of determining an item’s condition.

The true value of an Samsung Galaxy A21 depends on its condition and specifications like capacity and carrier. The most important factor will be the cosmetic and operational condition of your device. Of course, the better the condition the more money in your pocket, but the companies we search will even purchase broken devices!

Phone values depreciate by around 40% over one year, but that rate jumps to 75% over three years. At the same time, values for old Samsung models drop by 15% or more after a new flagship is released. That means you should sell as soon as possible to get the most money for your used Samsung.

Sending your phone to a Flipsy Trust Verified online buyback store is convenient since you’ll get a free printable shipping label and speed payments that are sent within 3 days of delivery. It's also worth mentioning that the buyback stores we search pay cash, not credit like carrier buyback programs which also offer 30% less comparatively.

Unfortunately, local selling options are limited in most areas.

The best option for selling your Samsung Galaxy A21 locally is to list it on a marketplace like Craigslist or Facebook Marketplace. This can be a good route for getting the most money for your Samsung, but be aware that there are several potential drawbacks which include:

• No guarantee of sale
• Fees can reduce profits (listing fees, selling fees, commissions, PayPal fees, etc.)
• Time-consuming listings with phone details, photos, etc.
• Sales can take a long time
• Potential for scams

Another consideration is a local buyback store or kiosk such as ecoATM. Although these offer the likelihood of a same-day payout, they don’t come without cons:

• Less money than other options
• Nearest store or kiosk could be far away
• Still no guarantee of sale
• Might offer store credit instead of cash

Lastly, most areas have brick & mortar carrier stores like Verizon, AT&T, and T-Mobile, but their trade-in programs often offer 30-50% less than your other options and they typically only offer store credit, not cash!

Yes! You can sell a locked or blacklisted Samsung Galaxy A21 on Flipsy by clicking the “Locked or Blacklisted? link on the price comparison page. “Blacklisted” typically means that a phone has been reported lost or stolen (they’re also referred to as phones with bad IMEIs or ESNs).

Learn more about how to sell locked and blacklisted phones.

Yes, you can! Phones can either be activation locked, which means software prevents them from being activated with a new carrier; or, they can be finance locked, which means you still owe money on the device so it cannot be transferred to another carrier. No matter the type of lock on your Samsung Galaxy A21, you can sell it through Flipsy.

To sell your locked or blacklisted Samsung Galaxy A21 on Flipsy, click the “Locked or Blacklisted? link on the price comparison page.

Learn more about how to sell locked and blacklisted phones.

Yes! To sell your financed Samsung Galaxy A21 on Flipsy, click the “Locked or Blacklisted? link on the price comparison page.

Yes. Many Flipsy stores purchase items in a variety of unfavorable conditions including Fair, Poor and even Broken. No matter what condition your item is in, you can sell it on Flipsy.

Flipsy buyback vendors will wipe your Samsung Galaxy A21's data when they receive it, but it’s a good idea to perform a backup and factory reset before shipping your device. This way you won’t lose any pictures, documents, or data you want to keep, and you’re protected if anything should happen to your device in transit to the buyer.

If you’re not sure how, check out our guides on how to reset Samsung devices.

Yes. Flipsy only lists offers from Trust Verified Stores who have a proven track record of conducting safe online transactions. Flipsy monitors review sites, customer feedback and rating services to make sure stores are maintaining good customer relationships. We invite you to view profiles, reviews, policies and contact information for every store we search.

Flipsy vets online buyback stores through a Trust Verification Process to eliminate the potential risks involved with shipping and selling your devices to an online company. Once a store is approved, Flipsy continues to actively monitor review sites, customer feedback, and rating services to verify that the stores consistently uphold positive customer relationships.

We invite you to view profiles, reviews, policies and contact information for every store we search.

Flipsy is confident that the iPhone 14 offer you'll receive will be unmatched by any other online buyback company. If you find a better price within 24 hours of completing your sale, we’ll match the price you find – plus beat it by $10!

Read more about the Flipsy Guarantee