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IMEI prefix 86503003 — Xiaomi Redmi 4X

The eight digits 86503003 identify a Xiaomi Redmi 4X. A phone whose IMEI starts with them is that model, whatever the seller wrote in the listing — the TAC is the manufacturer’s own allocation, not a lookup table someone typed by hand.

Have the full IMEI? The free TAC / IMEI lookup resolves it and returns the specification sheet. For the lock state, use the $0.03 SIM lock check — a model lookup cannot tell you whether the handset is carrier locked.

What this prefix tells you

TAC	`86503003`
Brand	Xiaomi
Model	Redmi 4X
Released	Released 2014, October
OS	Android 4.4.2, up to 6, EMUI 3
Display	5.5"
Chipset	Kirin 620

What a TAC cannot tell you

Three things decide whether a device is worth buying, and none of them is in the TAC: whether it is carrier locked, whether it is blacklisted, and whether iCloud or MDM is on. Those are separate records against the full IMEI, and each costs a few cents to read.

Carrier lock — the operator that owns the activation policy, from $0.03.
Blacklist — GSMA and carrier registers, from $0.03.
iCloud / MDM — the locks no unlock service can remove.

Same model, other prefixes

TAC from the GSMA allocation register, last updated 2026-10-28.