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Just prevent them to access the internet and have them all using a VPN, lock them down and use the provided apps and lock all external websites.
Also ask the network provider to block SMS and MMS
There, sorted, no need to update.
Just prevent them to access the internet and have them all using a VPN, lock them down and use the provided apps and lock all external websites.
Also ask the network provider to block SMS and MMS
There, sorted, no need to update.