Under this, the delivery person essentially arrives, uses Amazon's Key app to unlock your car, puts the package into the trunk of your car, and then locks it again.
The service has been launched in 37 metro areas in the US.
Both the smartphones will start selling from May 3 and will be Amazon-exclusive.
Notably, the third smartphone in the line-up, the Huawei P20, has not been launched in the country.
Apple will launch its Apple Watch Series 3 Cellular in India on May 11.
The standard GPS-only variant has been available in India since last year, but now the GPS+Cellular variant has also come to the market.
The smartwatch comes with a cellular connection, and through an e-SIM, lets users make calls, send SMS, receive notifications, and listen to music even without their iPhones.