8) Gresso Radical Black R3 ($2,500)

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High-end smartphone manufacturer Gresso offers the Gresso Radical Black R3. This 4.5 inch QHD dual-SIM smartphone runs on Android 4.1.2 Jelly Bean operating system. It uses a 1.2 GHz quad-core CPU and offers an 8 MP camera. The model comes with 32 GB of internal storage.