The only entity that can associate a mobile number with an ID is the telecom operator (Claro, Movistar, Entel, Bitel), and they are prohibited by law from sharing this data. If you find a website offering "mobile number search for Peru," it is either:
en Perú y cómo esta afecta la visibilidad de la información privada en directorios públicos. Privacidad: paginas+blancas+peru
In Peru, the most famous incarnation of this was the directory. For decades, Peruvians kept a thick white book near their landline telephones to look up neighbors, doctors, or family members. The only entity that can associate a mobile
Peruvian law still requires operators to provide printed directories upon request to protect the rights of those without internet access, the elderly, or low-income households. For decades, Peruvians kept a thick white book
You can find Páginas Blancas Perú, which is essentially a phone directory or a white pages service for Peru, through various online platforms. Here are some steps and alternatives to access such information:
Websites like "RENIEC Consulta Gratis" mimic the government portal. They ask for a DNI and then demand a payment of S/ 5.00 to "unlock" the name. This is illegal. Real RENIEC data is only available to registered entities.