This is great! I like how the filtering quickly lets you drill down and find phones that meet your criteria.

My suggestions for improving this would be to add:

- Dual SIM - many buyers, esp. in developing countries and frequent travellers prefer dual-SIM phones.

- Network Bands - many people have a preferred mobile network, e.g. Verizon or T-Mobile in the US, Telstra in Australia, etc. Each of these networks only supports specific frequency bands for 3G and 4G. So I'd suggest adding in a search-based filter which allows a user to find phones that support a particular band, e.g. 28 that their favorite mobile network uses.