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Its listings cover more than 270 organizations across sectors including telecommunications, energy, banking, insurance, transport, postal services and government. Visitors can search for companies such as Endesa, Iberdrola, Movistar, SEUR, Correos, Renfe, CaixaBank and the Spanish Tax Agency, and look for contacts related to billing, technical faults, bookings, complaints and other enquiries.

The directory focuses on helping users avoid expensive 902 calls by identifying free 900 or 800 numbers and geographic landlines that may be included in their phone plans. It also organizes contacts by industry and provides consumer information explaining Spanish telephone prefixes, potential call charges and options for contacting companies that offer only paid numbers. The site describes its listings as editorially reviewed and updated for 2026. Overall, telefonos-gratuitos.com combines a searchable contact directory with practical guidance to help people choose an appropriate customer service number and understand the likely cost of calling.