One network mitigation for Apple devices (e.g iPads) without a cellular baseband is to have a router block all connections to 17.0.0.0/8, except a once a week check for OS and app updates. This assumes no use of iCloud, which would siphon much more data than described in this article. It's also necessary to disable Siri on-device search (e.g. "Learn from this app") and Spotlight indexing of in-app content (per-app setting for "Show app in Search"), including E2E encrypted messengers like Signal and Wire.
For phones, the only mitigation is a lifestyle change to switch from always-reachable to scheduled availability windows or the always-async workflows of pre-mobile computing. A faraday bag can deny realtime telemetry, even if it's cached for relay when connectivity returns.
For phones, the only mitigation is a lifestyle change to switch from always-reachable to scheduled availability windows or the always-async workflows of pre-mobile computing. A faraday bag can deny realtime telemetry, even if it's cached for relay when connectivity returns.