The policy I mentioned above only applies to open areas. For closed areas it's a no-phone-at-all/leave-it-outside-the-room policy.
The policies have been evolving though. It used to be much stricter in the days when cameras were the exception rather than the rule. Now it's an attempt to balance the prevalence of smartphones with the needs of security. The real problem seems to be that at the government level the rules are vague and poorly worded at best leaving implementation to the local offices.