First of all "Flipkart " is the biggest online shopping portal.
Customer service of flipkart is always be good.
quality of the product is not so bad, if sometime product is not good it should easily return.
It mainly take 5-7 days to delivered the product. But always in time as they mentioned at the time of booking.
Services of App and websites are good. flipkart mobile app is also available and it easy to online shopping by android phone.