Name in the cause table
Not authorized for this CSG
Source: 3GPP TS 24.301 V20.1.0, clause 9.9.3.9, table 9.9.3.9.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24301-k10.zip in the 3GPP archive.
3GPP Scout / Reference / EMM causes / EMM cause #25
TS 24.301EMM cause
EMM cause #25: Not authorized for this CSG
In plain words
The UE has no subscription to operate in the CSG cell with CSG ID, or its subscription has expired. The network sends this cause there when the UE requests access or the network initiates a detach request.
Our summary of the spec text quoted below.
What the spec says
When it is used
This EMM cause is sent to the UE if it requests access, or if the network initiates a detach request, in a CSG cell with CSG ID where the UE either has no subscription to operate or the UE's subscription has expired and it should find another cell in the [...]
Source: 3GPP TS 24.301 V20.1.0, clause A.2. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24301-k10.zip in the 3GPP archive.
How this page was made
3GPP Scout built this page from TS 24.301 V20.1.0 as indexed on 2026-10-15. The quotes are copied from the spec, and code checks each one against the stored text and the 3GPP archive file before publishing. The plain-words line was written by an AI model (GPT-6 Sol) and checked against the quotes by a second AI model from another company (Claude Opus 5.5). The official 3GPP text governs.