OTA (Over The Air)

Over-The-Air refers to remote provisioning, configuration, and software updates delivered to devices via the cellular or Wi-Fi network, including SIM/USIM updates per ETSI TS 102 225/226, eSIM remote SIM provisioning, and firmware updates to handsets and IoT devices. OTA security relies on cryptographic authentication and integrity checks against signed payloads.

Categories: Radio Access NetworkIdentity and SubscriberSecurity Controls

OTA in context

The radio access network is where mobile devices attach to the operator's infrastructure. Attacks in this layer include IMSI catching, rogue base stations and downgrade attacks; defenses rest on mutual authentication, integrity-protected signaling and Open RAN supply-chain hygiene.

Subscriber identifiers (IMSI, SUPI, MSISDN, IMEI) anchor authentication, charging and lawful interception. Any protocol that leaks a permanent identifier is treated as a privacy defect, which is why 5G introduced SUCI concealment on the air interface.

To place OTA in the wider telecom-security picture, review 2G, Authentication, IMSI Catcher (Cell Site Simulator), USIM, WCDMA and SIM Swap — each entry cross-references back to this page so you can walk the topic in either direction.

Related terms

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