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Ofcom's Proposal:
On July 22, 2024, Ofcom proposed new rules to address the misuse of Global Titles (GTs) within the UK’s mobile network. GTs, created from UK mobile numbers, are essential for connecting mobile users and enabling communication across networks. However, they can be exploited for malicious purposes such as intercepting calls, tracking users, or disrupting networks. Ofcom’s proposals include:
- Banning leasing of Global Titles to third parties by operators that hold UK mobile numbers.
- Banning the creation of Global Titles from sub-allocated numbers by third parties.
- Strengthening rules to prohibit the misuse of Global Titles by operators that hold UK mobile numbers.
- Strengthening rules to prohibit the creation of Global Titles from numbers not allocated for use.
These changes aim to reduce malicious signalling and improve transparency among operators.
The new regulations are set to take effect immediately after Ofcom’s final decision for rules on misuse and creating GTs from non-allocated numbers. However, the ban on leasing and creating GTs from sub-allocated numbers will come into force on 1 January 2026. By tightening control over GT usage, Ofcom intends to safeguard both UK and international telecom networks, creating a more secure and accountable mobile communication environment. The consultation period for these proposals ended on 15 October 2024.
P1 Security's Response:
P1 Security has always been confronted to leased GTs in many SS7 attacks and see how this practice can lead to unsafe communication. As such P1 Security is publicly supporting Ofcom's proposal and responding to its consultation with the below document
