A Bronx mom threatened to pull off a Parkland-style mass shooting at her kid’s elementary school — because she was annoyed about losing her phone at the front desk, police sources said Friday.

Josette Smalls, 36, blamed workers at PS 48 Joseph R. Drake school in Hunts Point when she lost her cellphone Thursday morning, according to cops.

“If I don’t get my phone back, I’m going to come back and shoot up the school! No child is safe because what happened in Texas and Florida is going to happen here!’’ she allegedly raged — referencing the massacres at Marjory Stoneman Douglas HS in Florida and First Baptist Church in Sutherland Springs, Texas.

Smalls was arrested Friday, charged with making terroristic threats and released on her own recognizance.

The same day a couple of miles away, a student at a Bronx Catholic high school posted online threats to “shoot up the school,” police said.

Carlos Pastor, 16, was arrested for allegedly posting the message on Mount Saint Michael Academy’s Instagram page. He was charged with aggravated harassment.