AT&T Mexico is a consolidation of four brands: AT&T Mexico, Unefon, Nextel Mexico and Iusacell (Lusacell). Each carries its own legacy record, and that is the single biggest reason a Mexican unlock order gets refused: the phone was sold by Unefon, the order was submitted as AT&T, and the carrier answered "not our device".
The lock is an activation policy against the IMEI. The brand that sold the phone owns the record, even though the network and the billing now belong to AT&T Mexico.
These handsets are also commonly sold on instalment plans and resold before they are paid off, which makes the "clean but ineligible" case very common.
The phone is not damaged and it is not stolen by default: the manufacturer holds an activation policy against the IMEI that names the carrier the device may activate on. Until that record changes, every other SIM is refused at activation — Wi-Fi keeps working, which is why a locked handset can look perfectly healthy in a shop.
AT&T Mexico applies the AT&T group's conditions: device paid off, account in good standing, IMEI not reported, request from the account holder. Legacy Unefon, Nextel and Iusacell records are still handled, but they have to be submitted against the right brand.
Reported or unpaid devices are refused, and a "premium" tier is the only route that absorbs an unpaid balance.
The current wording is always on the carrier’s page: AT&T Mexico support.
This is where the paid tiers earn their price: the brand mismatch, the unpaid balance and the financed-device cases all live here. The tiers are split by model generation and by brand precisely so a refused order stays rare.
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Same group, different legacy records. Submit against the brand that sold the phone.
The IMEI was submitted to a brand that does not own the record.
Only on a premium tier — that is what the balance-absorbing tiers are for.
Yes.
No, the IMEI is enough.
Last checked 2026-10-28. Carrier rules are summarised from the operators’ own pages; where a rule has changed since, the operator’s page wins.