Back-to-school season brings a predictable wave of phone repairs and accessory sales. Learn how repair shops can turn the rush into profit with protection-first offers, on-demand screen protectors, and smart student promotions.

The repair gets customers through the door. The real margin can come from what you sell next. Screen protectors can turn a low-cost add-on into one of the most profitable sales in your shop.

Most repair shop owners will tell you the money is at the bench: screen repairs, battery swaps, the occasional water-damage rescue. They're not wrong about where the volume is. A screen repair brings in $80 to $150, and it's usually what gets someone through the door in the first place. The trouble is that the repair is often the least profitable thing you'll sell that customer all day. Once you cover the part, the labor, and the warranty risk you're carrying if it comes back, the margin is...