Why repair techs put tape on your screen
This is precisely why you need to be careful when having a tempered glass screen protector installed at roadside shops. When a customer pays for a screen protector, the repair technician sometimes starts by applying clear tape to the screen instead of directly applying the glass. At first glance, this might seem strange, even like a scam. However, this step has a specific purpose: to remove any remaining dust particles from the phone's surface. Once the screen is perfectly clean, the technician can then apply the tempered glass screen protector precisely and without bubbles, for a clean and perfectly fitted result.
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