It's rude to answer a phone while helping a customer.
There is a long line at the counter where Pedro works at the bakery.
Pedro wants to sell a cake.
Pedro puts his phone on silent and is attentive to his many customers, and checks it on his break.
Pedro answers his cell phone in the middle of a transaction for an expensive wedding cake without greeting the customer.
The line full of customers is helped quickly and Pedro's business thrives.
Pedro gets a glare from the customer, and they never return, and spread negative reviews on social media.