Specifications

Processor: Quad-core 1.2GHz Qualcomm Snapdragon 400, Screen Size: 5.0in, Screen resolution: 1,280x720, Rear camera: 10-megapixel, Storage: 16GB, Wireless data: 3G, 4G, Size: 139x71x8.5 mm, Weight: 150g, Operating system: Windows Phone 8.1.

The Nokia Lumia 830 is a cheaper version of the excellent Lumia 930, and this beautifully made handset looks just as high-end as the range-topping Lumia 930.
Admittedly, the Lumia 830's quad-core 1.2GHz Qualcomm Snapdragon 400 processor is a big step down from the 930’s 2.2GHz Snapdragon 800 processor, and it puts the Lumia 830’s performance roughly on par with more budget-orientated phones such as the Lumia 630 and the new Motorola Moto G (2nd Gen). For instance, which is just over 200ms faster  than the Lumia 630 and the new Moto G’s scores. The Lumia 930, meanwhile, is streets ahead with its score of 512ms.

Camera

       On the back of the Lumia 830 is a 10-megapixel camera, and the Lumia 830 has a proper shutter button and optical image stabilisation. There's also the option to rotate and re-crop your photos after you've taken them, and make them the ideal size for uploading to Instagram and other social media sites. Our outdoor shots looked great. Colours were a fraction warm, but the camera coped well in both sunny and cloudy conditions. The sky was exposed correctly in both circumstances and there was plenty of detail on show in every part of the frame.
       In addition to the default camera app bundled with all Windows Phone devices, Microsoft adds five Lumia-branded apps for capturing photographs and other related functions: Lumia Camera, Lumia Cinemagraph, Lumia Creative Studio, Lumia Selfie and Lumia Storyteller

 

Ford cortana

       One of the most anticipated features of Windows Phone 8.1 is Cortana, which is Microsoft's answer to Apple's Siri. Cortana acts as a personal digital assistant that can search the web to answer questions, make calendar appointments via voice control and help you keep track of your diary. When you first turn Cortana on it'll ask you a couple of questions to get an idea of your main interests. It'll then use this information to populate Cortana's home page with useful bits of information, such as the current weather, news and any calendar appointments. You can then either type or speak a question and it'll do its best to answer that question.

Performance

           The Snapdragon 400 SoC under the hood of the phone is fairly powerful and we rarely faced any hiccups in daily use. Casual games work fine but Asphalt 8 lagged intermittently. In our GFXbench test the Adreno 305 GPU managed to earn a score of 7.2fps, which is pretty low. The AnTuTu and WPBench scores were on par with those of the more expensive Lumia 830, which bodes well for the device. The phone logged 11,922 and 241.28 points, respectively, in these tests.

       The phone ran our HD (720p) videos just fine but failed to play 1080p videos. The speaker is loud enough for most practical purposes and thankfully the sound doesn't crackle at high volumes. The bundled earphones are comfortable to use and sound pretty decent too. Nokia's phones usually have great sound quality in calls and this hasn't changed with the Lumia 730 Dual SIM. We didn't face any call drops and sound was crystal clear too. In our battery test the phone lasted 12 hours and 44 minutes, which is excellent. One can expect the phone to last at least a day and half with moderate usage.