# Tracking Area Code ## Identification [[Public Land Mobile Network|PLMN]] identifiers combine country and network codes; `310 260` identifies T-Mobile US. [[E-UTRA Absolute Radio Frequency Channel Number|EARFCN]], [[Tracking Area Code|TAC]], [[Physical Cell ID|PCI]], and cell/eNodeB identifiers are LTE radio-access fields. The copied placement of `31955` beside both EARFCN and TAC may reflect a transcription error rather than a genuine equality. [[Wi-Fi Direct|Wi-Fi Direct]] creates peer-to-peer groups whose generated SSIDs often begin `DIRECT-`. ## Notebook evidence - [[Scanned_20260730-1719#PDF page 6 — T-Mobile LTE cell identity and Wi-Fi Direct names|PDF page 6: T-Mobile LTE cell identity and Wi-Fi Direct names]] — The author is correlating cellular infrastructure with nearby peer-to-peer and conventional Wi-Fi names at a specific moment. Together with pages 4–5, this forms a three-page radio and access-network survey: gateway, Wi-Fi environment, then cellular cell. ## Relationships and overlays The source places this note in a shared evidence cluster with [[E-UTRA Absolute Radio Frequency Channel Number|E-UTRA Absolute Radio Frequency Channel Number]] · [[Physical Cell ID|Physical Cell ID]] · [[Public Land Mobile Network|Public Land Mobile Network]] · [[Scanned_20260730-1706|Scanned_20260730-1706]] · [[Wi-Fi Direct|Wi-Fi Direct]]. Within the larger collection, this evidence extends [[Vendor-Agnostic Recovery|vendor-agnostic recovery]] and [[Continuity Architecture|continuity architecture]] by showing how software, hardware, identity, and pre-OS control depend on recoverable interfaces. ## Evidentiary status and open leads Reconstruct the cell only with a contemporaneous tower database and timestamp. Avoid treating playful SSIDs such as “PizzaToday” as verified owner names. ## Source - [[Scanned_20260730-1719|Scanned_20260730-1719]]