Apple has introduced incentives to make the iPhone more affordable for customers in India. Indian students who trade in an old smartphone will get 7,777 rupees ($144) toward a new iPhone. Non-students will earn the equivalent of $130 toward an iPhone purchase. Additionally, customers who use an American Express credit card to purchase an iPhone will receive ten percent cash back — a maximum refund of $111 to customers who purchase an iPhone 4, 4S…