9º Dígito Leucotron

9º Dígito Leucotron is a Chrome extension designed to automate adding the ninth digit to Brazilian mobile phone numbers stored in your device's internal memory. This tool ensures that your contacts conform to Anatel's updated schedule for phone number formatting across multiple Brazilian states.

The extension covers states where the ninth digit is already mandatory, such as São Paulo, Rio de Janeiro, Minas Gerais, Bahia, and others. It also helps users prepare for upcoming changes in states like Paraná, Santa Catarina, and Rio Grande do Sul. Users should note that contacts stored on SIM cards won't be processed, and syncing with remote accounts like Google or Samsung might revert changes if not managed properly.