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Tata Docomo Customer Care Toll free Number. Tata Docomo Customer Care Number: 121 (for Tata Users) Tata Docomo Toll Free Number: 1800-420-8282 (for All Users) Email: listen@tatadocomo.com.How to reach a Customer Care Executive: Dial 1800-420-8282 Press 1, 2 for Language Press 2 Press 1.ata Docomo offers Tata Docomo Customer Care Number to maintain a healthy relation with the customers and also satisfy all their needs.