Sellers should not publicly share IMEI, ESN, or serial numbers for devices. Your IMEI number is considered private information until your item is sold.

• Buyers can ask sellers to check the IMEI with a carrier they'd like to use by supplying a link to the carrier's BYOD (Bring Your Own Device) carrier compatibility page.
• Buyers shouldn’t post listing comments asking for the IMEI before purchase.

Sellers: If you are wondering whether it is safe to send the IMEI to a buyer -- it is safe to send the IMEI to a buyer provided it is being shared privately, and after the device has been purchased.

Buyers: If you aren't sure if the phone you’re looking at is compatible with your carrier -- you can learn more about carrier compatibility on the Swappa blog:

• Unlocked iPhone Carrier Compatibility Guide
• Android Phone Compatibility Guides