Just one week after announcing that it had reached a deal with Apple to sell the iPhone 3GS in India, Bharti Airtel will officially launch the handset on its network. According to Reuters, the 16GB model will sell for 35,500 rupees (roughly $780) while the 32GB model will be priced at 41,500 rupees (~$913). In addition, all iPhone 3GS customers will receive 500 MB of free data every month for a year from the date of activation. Bharti Airtel first…