Amazon has announced the Blu R1 HD, an inexpensive Android smartphone that will be sold unlocked starting July 12. The R1 HD boasts curved Gorilla Glass 3, a metal frame, and soft-touch paint job on the rear cover to give it a premium feel. The screen measures 5 inches with 720p HD resolution and the phone is powered by a 1.3 GHz quad-core MediaTek 6735 processor with 8 GB of storage and 1 GB of RAM. The R1 HD includes an 8-megapixel main camera with f/2.0 aperture and LED flash, while the selfie camera — which has an LED flash of its own — captures 5-megapixel images. The phone can record video up to 1080p HD. The Blu R1 HD runs Android 6.0 Marshmallow and comes with support for two SIM cards and microSD cards up to 64 GB. The phone is sold unlocked and is compatible with the networks run by AT&T and T-Mobile (LTE in Bands 2, 4, 7, 17). The device costs $100, but will be sold exclusively by Amazon for $50 with ads and promotions appearing on the lock screen. A second variant includes 16 GB of storage and 2 GB of RAM for $10 more