Asus Zenfone 2 ZE551ML (4GB RAM 16GB ROM 1.8 GHz)

While all the other mobile device manufacturers are using Qualcomm or MediaTek chipsets in their smartphone devices, Asus has chosen to go with Intel Atom chipsets; the Asus Zenfone 2 ZE551ML uses a quad-core Intel Atom Z3580 processor clocked at 2.3GHz. The Intel Atom Z3580 uses the PowerVR G6430 GPU for graphics. Intel Atom processors are known for providing superb performance and low power consumption. The powerful chipset is mated to 4GB of RAM, although you can purchase the 2GB variant for a lesser price.

The Asus Zenfone 2 ZE551ML comes with a 13-megapixel rear-facing primary camera and a 5-megapixel front-facing camera. The primary camera has no laser autofocus or phase detection autofocus; it only comes with a LED flash. It is a traditional 13MP camera found on many budget devices. Although, Asus provides on of the best camera user interface found on the budget mobile devices.

The Asus Zenfone 2 ZE551ML was launched with Android 5.1 Lollipop and just a few days after the launch Asus has provided the device with the OTA update for Android 6.0 Marshmallow. Receiving the Marshmallow update is a big deal as it improves the overall device performance and decreases the battery power consumption with its Doze functionality. Asus has tweaked the OS with the ZenUI.

The display on the Asus Zenfone 2 ZE551ML is a 5.5-inch Full-HD unit with IPS technology, and it is protected with a layer of Gorilla Glass 3. The display looks pixelated even though it has a good resolution and it is the case with almost all the Asus mobile phone devices. The battery is a 3,000 mAh Li-Po unit that is not removable; it can be quickly charged up to 60% in 40 minutes.

The internal storage on the Asus Zenfone 2 ZE551ML is 16GB, and it can be expanded up to 256GB via the dedicated microSD card slot. Other variants with higher storage capacity can be found here. The connectivity includes the fast Wi-Fi ac that runs on the 5GHz frequency. The Asus Zenfone 2 ZE551ML is a dual-SIM, dual-active 4G device that can accommodate two micro SIM cards.