Talk as you pay, pay as you talk
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Tata Docomo
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Tata Indicom
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Airtel
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Aircel
B
Correct answer
Explanation
Tata Indicom used 'Talk as you pay, pay as you talk' to promote its prepaid mobile services, emphasizing the pay-as-you-go model. This tagline highlighted the flexibility and transparency of their pricing. Tata Docomo (a later Tata brand), Airtel, and Aircel had different advertising slogans.