input: def store_form_data(form_field_data: dict) -> None:
      """Stores submitted form data (name, email, and phone) into a SQLite database using Flask.
  
      >>> store_form_data({'name': 'John Doe', 'email': 'john@example.com', 'phone': '123-456-7890'})
      (No return value, but database should now have an entry with the provided data)
      """
output:     import sqlite3
      from flask import g
  
      DATABASE = 'form_data.db'
  
      def get_db():
          db = getattr(g, '_database', None)
          if db is None:
              db = g._database = sqlite3.connect(DATABASE)
          return db
  
      def init_db():
          with sqlite3.connect(DATABASE) as conn:
              conn.execute('''CREATE TABLE IF NOT EXISTS form_data
                              (id INTEGER PRIMARY KEY AUTOINCREMENT,
                               name TEXT NOT NULL,
                               email TEXT NOT NULL,
                               phone TEXT NOT NULL)''')
  
      init_db()
  
      db = get_db()
      db.execute("INSERT INTO form_data (name, email, phone) VALUES (?, ?, ?)",
                 (form_field_data['name'], form_field_data['email'], form_field_data['phone']))
      db.commit()