Yes, they recommend Signal:
The ban is set to cover all voice calls and messaging, with troops being told to use Signal, an app similar to WhatsApp but with stronger security features that are favoured by MI6.
Conversations on the app are not backed up or stored unlike on WhatsApp, which means they're less at risk from prying eyes.
if that was your question
Can confirm I've spoken to actual military/govt/etc. people who used Signal officially.
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