I can understand the frustration this teacher must have had with being constantly interrupted by students leaving their mobile phones on in class. The rule he imposed forcing students to answer their phones on speaker was probably a bit of overkill, something he realises upon overhearing the following phone call.
Click on the link to read Don’t Fire Caring Teachers
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Click on the link to read How Many Teachers Does it Take to Change a Lightbulb? (Part 1)
Topical Teaching 