GrapheneOS supports LTE-only mode for that purpose: https://grapheneos.org/usage#lte-only-mode https://grapheneos.org/usage#lte-only-mode > This feature is not

GrapheneOS supports LTE-only mode for that purpose: https://grapheneos.org/usage#lte-only-mode https://grapheneos.org/usage#lte-only-mode > This feature is not intended to improve the confidentiality of traditional calls and texts, but it might somewhat raise the bar for some forms of interception. It's not a substitute for end-to-end encrypted calls / texts or even transport layer encryption. LTE does provide basic network authentication / encryption, but it's for the network itself. The intention of the LTE-only feature is only hardening against remote exploitation by disabling an enormous amount of both legacy code (2G, 3G) and bleeding edge code (5G).