Free shipping · 14-day price lock
Sell Samsung Galaxy S21 for cash
CellBack buys used Samsung Galaxy S21 phones by mail. Pick your storage, carrier status, and condition to see your offer, then ship it free with a tracked prepaid label. We lock the price for 14 days and send payment within 1–2 business days of approving your Galaxy S21.
How it works
Five steps.
No listings, no meetups.
- 01
Get your quote
Choose your Galaxy S21’s storage, carrier status, and condition to see your offer. It’s locked for 14 days.
- 02
Ship it free
We email you a tracked, prepaid shipping label. Pack it securely and drop it off.
- 03
We inspect it
If it doesn’t match your description, we send a revised offer. Decline it and we return your device free.
- 04
We wipe it
Every device is wiped on intake, and we verify the reset before it’s resold or recycled.
- 05
You get paid
Payment is processed within 1–2 business days of approval, by PayPal, Zelle, or check.
Questions first? Read the FAQs or email support@cellback.net.
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