Yep, DC, you'd be sacked in minutes at my last school!
I agree that a teacher that shouts a lot is one who often has lost control... but there are times when it is needed, and teachers should have the right to be able to make a professional decision to do it without fear of a black mark against them. I honestly cannot remember the last time I shouted at a kid, but I would want to keep the right to do if they are being a right pain in the backside and little else is working.
As for taking away the mobiles, the whole thing about escalating the punishment is against the whole ethos of what the government is trying to do... so you escalate it, then what? Give them a DT? They don't turn up (Often with a letter from the parent stating that they do not support the Dt and will not allow their child to sit it!). Then what? the only real alternative is to exclude (either internally or externally). Exclude them internally, and the student bunks school, so this is escalated to external but then there are government limits on external exclusions and nowadays in some counties, you are not allowed to externally exclude until you can swap your excluded student for another... so an excluded student can be in your school for days or weeks until a swap is found.
Quite frankly, there are so many limits being placed on what teachers are not allowed to do these days that we're in a straightjacket for enforcing such rules and mostly have to rely on their good will and cooperation to make the class work.
If you don't believe me, look at the recent cases that have been to the courts on human rights grounds...
One Scottish girl took her school to court for giving her a detention for doing her maths homework in a completely different lesson.
Another boy took his school to court for permanently excluding him after he tried to set his school on fire. (Apparrently, it contravened his right to an education).
A third girl took her school to court for insisting she wore the school uniform (She wanted to wear the hijab instead).
These are genuine cases, and given that teachers are not allowed to touch students (I don't mean hit, but even to prevent them leaving or hitting another student), threats of court cases and disciplinary action, its all very well having these ideals, but they are not the reality of what teachers are allowed to do in the modern secondary school classroom.