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IMEI and ESN Basics Guide
What IMEI, ESN, and MEID numbers are, how to find them on any device, and how to check for blacklist or financing holds before you buy or sell.
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What this IMEI and ESN Basics Guide helps you do
Learn what IMEI, ESN, and MEID numbers actually are, how to find them on any device in seconds, and how to check clean vs blacklisted status before you buy or sell.
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IMEI & ESN Basics FAQ's
What's the difference between IMEI, ESN, and MEID?
IMEI is the 15-digit identifier used on GSM and LTE networks and is what virtually every modern phone uses. ESN was the older identifier for legacy CDMA networks like old Verizon and Sprint. MEID replaced ESN on CDMA devices and often appears alongside the IMEI on transition-era phones. Today, IMEI is the number you'll use almost every time.
How do I find a phone's IMEI if it won't turn on?
Check the SIM tray, which often has the IMEI etched into the metal, or the original retail box, which has a barcode sticker with the IMEI printed on it. If neither is available, the carrier account tied to the device will have it on file.
What does it mean if an IMEI comes back blacklisted?
A blacklisted or blocked IMEI means the device has been flagged and can't activate on some or all networks. Common reasons include being reported lost or stolen, an unpaid financing balance, or an insurance fraud flag. Whether the block can be cleared depends on the reason and the carrier's policy — always verify with your carrier or master agent.
Can a device be clean on one carrier but blocked on another?
Yes. Some blocks are carrier-specific rather than global. A device can activate fine on one network but get rejected on another. A GSMA-level blacklist flag, by contrast, typically blocks activation everywhere. Rules and scope vary, so verify current policy with your carrier or master agent.