I always use Bitfort https://www.thebitfort.com which is one with the best price among all other Bitcoin exchanges! You all can buy and sell Bitcoin from BitFort Wallet which is available for both IOS and Android.
BitFort is the first crypto wallet in India where you can buy and sell Ripple as well as Ethereum directly to Indian Rupees.
Download Bitfort for
IOS: https://itunes.apple.com/us/app/bitfort/id1329678083?mt=8&ign-mpt=uo%3D2
Android: https://play.google.com/store/apps/details?id=com.cryptomining.bitcoin

You can become part of our telegram channel: https://t.me/bitfort