You are allowed to bring your cell phone with you and it will be secured in a safe place. It can be used in emergency situations under staff supervision.
No, they keep cell phones locked up with other valuables. It might be possible to get permission for a supervised call to someone whose number you don't have memorized, though.
There are "community" cell phones which are available when not in group or counseling activities. While they do not have a specified limitation on time, they do ask to keep them at or under 10 minutes for courtesy to others.
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