Lots of misinformation about what can or cannot happen if you get caught and about phones in hospitals.
The answer is, and always will be... It varies. There is no definitive "this" or "that", or "yes" or "no".
In some jurisdictions, you could have your house searched and be fined and imprisoned. In others, they take you to a psych ward for evaluation. In others, all they do is a welfare check and leave it at that. Or you could just get a letter in the mail and hear nothing else of it. In some places, it could depend on what resources a police force is allocating and where, or what their priorities are on that particular day. It could depend on the current political climate or public or media pressure, be it local or national or international. What happens may even depend on what kind of mood the officers are in at the time they attend your residence. It could depend on how they perceive your behaviour at the time, or they could have already made up their minds about what they're going to do with you before they even see you.
No one can definitively say what happens if you get caught. There can only be anecdotal stories and speculation.
Phones in hospitals... Some allow them in the ward itself. Others don't. Some grant their use as an earned privilege, in which case they may allow it on the ward itself or only when you're off ward. Others may flat-out refuse it until you're released. If you have people visiting you, they may or may not get their phones taken off them. Not all areas of a psych ward are 100% monitored or covered by surveillance. There may be blind spots. Rooms may or may not have cameras in them. What may have been true for a particular hospital at one point may no longer be accurate now. A hospital's policies can change. Regardless of policies, phones could also be smuggled in - could be virtually impossible in some hospitals but simple in others.
No one can definitively say whether or not phones can be used on a psych ward. There can only be anecdotal stories and speculation.