OnePlus has announced that its OnePlus 3T variant will be discontinued soon making way for the OnePlus 5 variant. But the OnePlus 3T (both 64gb and 128gb will be available in India for buying until end of this year. But it must be understood that company will not manufacture futher the 3T variant but available until the stock lasts.
OnePlus has, however, will continue to offer software updates for the OnePlus 3/3T though. OnePlus products and accessories are available through all three official sales channels, including oneplusstore.in, Amazon.in and the OnePlus Experience Store in Bangalore.