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Redmi Note 4

The Redmi Note 4 is a Android smartphone developed and manufactured by under its sub-brand , featuring a premium all-metal unibody design, a 5.5-inch Full HD LCD display with pixel resolution, a 13 MP rear camera with phase detection autofocus, a 5 MP front camera, and a high-capacity 4100 mAh non-removable . It was first announced on August 25, 2016, in with a Helio X20 deca-core processor (2.1 GHz), available in configurations of 2 GB or 3 GB RAM paired with 16 GB or 64 GB internal storage. A global variant powered by the 625 octa-core processor (2.0 GHz) followed, launching in on January 19, 2017, with options of 2 GB/32 GB, 3 GB/32 GB, or 4 GB/64 GB RAM/storage configurations, expandable via microSD up to 128 GB. Both versions run on skin over 6.0 , with the Snapdragon variant upgradable to 7.0 ; they support dual-SIM 4G LTE with VoLTE, include an IR blaster for functionality, and measure 151 × 76 × 8.35 mm (, 175 g) or 8.45 mm (Snapdragon, 165 g). Priced affordably starting at around ₹9,999 (approximately $146) for the base global model, the Redmi Note 4 achieved massive commercial success, selling 250,000 units in its inaugural 10-minute flash sale in and surpassing 5 million units sold there within six months of launch.

Development and launch

Announcement

The Redmi Note 4 was developed as a budget within 's Note series, positioned as the successor to the to address user demands for improved battery endurance and overall performance in affordable devices. officially announced the variant of the Redmi Note 4 on August 25, 2016, during an event in , marking it as the initial entry in the lineup before subsequent global adaptations. Leading up to the announcement, released several teasers highlighting the device's full metal unibody construction, described in promotional materials as ushering in a "national full metal age" for budget smartphones, alongside emphasis on its 4100 mAh battery capable of delivering up to 25% longer life compared to the predecessor. In its development context, the Redmi Note 4 was targeted at emerging markets such as , where sought to maintain affordability while achieving feature parity with more premium smartphones through efficient hardware optimizations and cost-effective manufacturing.

Release and pricing

The variant of the Redmi Note 4 was released in on August 25, 2016. The Snapdragon variant followed with a global rollout beginning in January 2017, starting with its launch in on January 19, 2017. By mid-2017, the device expanded to additional markets, including in May and in March, marking 's push into and . Initial availability in was through Xiaomi's official Mi.com website, with sales beginning on August 26, 2016. In , the phone was sold exclusively via Mi.com and , with the first open sale occurring on January 23, 2017. This online-first strategy helped Xiaomi manage high demand, as evidenced by the sale of over 250,000 units within the first 10 minutes of availability. Pricing for the variant in started at 899 CNY (approximately $135 USD) for the 2 GB RAM/16 GB storage model and reached 1,199 CNY (approximately $180 USD) for the 3 GB RAM/64 GB storage configuration. The Snapdragon variant in launched at ₹9,999 (approximately $146 USD) for the 2 GB RAM/32 GB storage model, ₹10,999 (approximately $161 USD) for the 3 GB RAM/32 GB storage, and ₹12,999 (approximately $190 USD) for the 4 GB RAM/64 GB storage option. positioned the Redmi Note 4 as a budget-friendly alternative to competitors like the , emphasizing value through metal construction and capable hardware at sub-$200 pricing. A gold color variant was offered in India alongside standard grey and silver options, available across all configurations from launch.

Design

Build and materials

The Redmi Note 4 features a unibody metal construction crafted from anodized aluminum, providing a premium feel within the budget smartphone segment through a high-gloss CNC finish and elegant separation lines. This aluminum frame encases the device, contributing to its solid build quality and weight of 165–175 g depending on the variant, while incorporating subtle antenna bands for signal reception without compromising the overall metallic aesthetic. Available in several color options including dark gray, , , and , the device offers regional variations to suit different markets, with the anodized finish enhancing durability against fingerprints and minor wear. The front is protected by curved glass, which adds to the ergonomic taper along the edges for improved one-handed grip, though it lacks an official rating for water or dust resistance. Ergonomically, the rounded chamfered edges on both the front and back facilitate comfortable handling, complemented by a SIM tray on the left side that supports nano-SIMs or a single nano-SIM paired with a microSD card for expandable storage up to 128 GB. The metal power button and volume rocker provide tactile feedback, reinforcing the device's robust yet lightweight design at 8.35 mm thickness.

Physical dimensions

The Redmi Note 4 measures 151 mm in height, 76 mm in width, and 8.35 mm in thickness for the variant, providing a compact suitable for mid-range smartphones of its era. The Snapdragon variant has nearly identical dimensions at 151 mm by 76 mm by 8.5 mm, with minor variations attributed to internal component adjustments. These measurements contribute to its overall portability, allowing it to fit comfortably in most pockets or bags without excessive bulk. In terms of weight, the variant weighs 175 grams, while the Snapdragon variant is lighter at 165 grams, a difference from optimizations in internal hardware and materials for better thermal management in the latter. This reduced weight in the Snapdragon model enhances ease of handling, particularly for prolonged use. The device's features a 5.5-inch front protected by curved glass for a smooth edge-to-edge feel, with a rear-mounted fingerprint sensor positioned centrally below the camera module for intuitive access. At the top, a grille enables clear audio output, while the bottom edge houses the USB 2.0 for charging and data transfer alongside a 3.5 mm headphone jack for wired audio connectivity. The aluminum frame and back panel contribute to a premium tactile experience. Despite its large screen size, the Redmi Note 4's balanced weight distribution—centered around the and main components—facilitates one-handed operation for tasks like scrolling or typing, making it user-friendly for on-the-go scenarios. This design choice prioritizes , reducing fatigue during extended handling.

Specifications

The Redmi Note 4 features a 5.5-inch LCD with a of 1080 x 1920 pixels, delivering Full HD visuals at approximately 401 pixels per inch for sharp image quality. The panel includes enhancements such as a 1000:1 and 72% color gamut, contributing to good sunlight legibility suitable for outdoor use. Powering the device is a 4100 mAh non-removable Li-Polymer battery, which provides robust endurance, supporting up to 12 hours of continuous video playback or approximately two days of moderate usage including web browsing and calls. The battery supports 5V/2A charging for efficient recharging. The rear camera system consists of a 13 MP CMOS sensor with phase detection autofocus (PDAF), an f/2.0 aperture, and a dual-tone LED flash, enabling detailed photography and 1080p video recording at 30 fps. The front-facing 5 MP camera, also with an f/2.0 aperture, supports 1080p video and includes beautification modes for selfies. Memory configurations include 2 , 3 , or 4 of LPDDR3 paired with 16 , 32 , or 64 of eMMC 5.0 internal storage, expandable via microSD up to 128 using the hybrid SIM slot. Connectivity options encompass 4G LTE support (FDD-LTE/TDD-LTE bands including B3/B5/B40), 802.11 a/b/g/n, 4.1, GPS/AGPS// navigation, and an for remote control functionality. The device integrates a suite of sensors, including an , gyroscope, , electronic , , Hall sensor, and rear-mounted fingerprint sensor, enabling features like automatic screen rotation and detection. Processor variants differ by region, with the global model using a 625 octa-core chip at 2.0 GHz, while the Chinese version employs a Helio X20 deca-core processor.

Software

The Redmi Note 4 launched with 6.0 overlaid by Xiaomi's 8 user interface, which introduced customizable theming options, an optional app drawer for organizing installed applications, and seamless integrations with Xiaomi's ecosystem services such as Mi Cloud for data backup and synchronization. Over its support lifecycle, the device received official updates to 9 based on 7.0 for the Snapdragon variant, while the version remained on Android 6.0 with updates up to version 10; further refinements extended to 11 on Android 7.0 for the Snapdragon model, with major software support concluding in 2019. Security patches were provided up to approximately early 2019, aligning with the end of official firmware maintenance. MIUI on the Redmi Note 4 included notable features such as the Mi Remote app, leveraging the device's built-in IR blaster for controlling compatible home appliances like televisions and air conditioners; the Dual Apps functionality, which allowed users to clone and run parallel instances of select applications such as for managing multiple accounts; and the fingerprint sensor integration for secure unlocking directly from the . The software came pre-installed with various Xiaomi-branded applications, including Mi Browser, Mi Music, and system utilities, often categorized as bloatware due to their non-essential nature for some users; however, provided built-in options to disable or hide many of these apps through the settings menu, with advanced debloating possible via developer tools without requiring access.

Variants

MediaTek variant

The MediaTek variant of the Redmi Note 4, targeted primarily at Asian markets, features the Helio X20 processor, a deca-core built on a 20nm process with a tri-cluster architecture consisting of two Cortex-A72 cores clocked up to 2.1 GHz for high-performance tasks, four Cortex-A53 cores at up to 1.85 GHz for medium loads, and four additional Cortex-A53 cores at 1.4 GHz for efficiency. This is paired with a Mali-T880 MP4 GPU running at 780 MHz, enabling decent graphics performance for gaming and . In terms of performance, the Helio X20 configuration proved suitable for everyday multitasking and light , achieving an benchmark score of approximately 85,000 points, which positioned it competitively among devices of its era. However, under sustained heavy loads such as prolonged sessions, the device experienced thermal throttling due to the 20nm node's heat generation, leading to reduced clock speeds to manage temperatures. This variant was released in August 2016, initially in with configurations including 2 GB /16 GB , 3 GB /64 GB , and up to 4 GB /64 GB options, all expandable via microSD. Unique to this model were its enhanced band supports, including bands 1, 3, 5, 7, 8, 38, 39, 40, and 41, which provided better compatibility with carriers like those using band 40 (2300 MHz) for TDD-. Despite these advantages, the chipset exhibited higher power consumption compared to the Snapdragon counterpart, resulting in slightly shorter endurance during intensive use, though the shared 4100 mAh still delivered solid all-day performance for moderate tasks.

Snapdragon variant

The Snapdragon variant of the Redmi Note 4 features the 625 chipset (MSM8953), a 14 nm octa-core processor clocked at up to 2.0 GHz using cores, paired with an Adreno 506 GPU. This configuration emphasizes power efficiency over raw power, thanks to the advanced FinFET manufacturing process, enabling sustained performance in everyday tasks and light gaming without excessive throttling. Released internationally in January 2017, this model targeted global markets with configurations including 2 GB RAM/32 GB storage, 3 GB RAM/32 GB storage, and up to 4 GB RAM/64 GB storage (expandable via microSD). It achieved broader carrier certifications, facilitating compatibility in regions like the and . In benchmarks, the device scored approximately 62,000 on v6, reflecting stable gaming performance with effective heat management that keeps temperatures under control during extended use. Unique to this variant, the Snapdragon 625 includes hardware support for 3.0, although Xiaomi did not enable it in software, and it offers enhanced VoLTE compatibility for high-definition voice calls on international networks. The display and other peripherals remain consistent with the overall hardware specifications.

Reception and legacy

Critical reception

Upon its release in 2017, the Redmi Note 4 received largely positive reviews from professional outlets, particularly for its impressive life, premium metal construction, and exceptional value in the budget segment. Reviewers highlighted the 4,100mAh 's endurance, capable of delivering over 10 hours of screen-on time under mixed usage, making it a standout feature for extended daily performance. The all-metal unibody design was praised for its sturdy build and ergonomic feel, elevating the phone beyond typical budget expectations. GSMArena described it as a "hidden gem" for these qualities, awarding it a strong endorsement in the mid-range category, while Android Authority called it a "well-rounded package" that excelled in delivering flagship-like and build at a price starting around $150. The camera also garnered favorable mentions for daylight performance, with the 13MP rear sensor producing sharp, color-accurate shots in good lighting conditions, suitable for casual . However, criticisms focused on its limitations in low-light scenarios, where images often appeared grainy and lacked detail. Software aspects drew mixed feedback, with some bloatware in proving persistent and uninstallable, alongside average display brightness that struggled in direct . However, the device faced criticism due to several reported incidents of explosions in 2017, which attributed to third-party chargers or extreme external force. User feedback echoed these sentiments, with the phone earning high marks for affordability and reliability on platforms. On , it achieved an average rating of 4.4 out of 5 from over 1 million reviews, with users frequently commending its cost-effectiveness and longevity as key strengths, though some expressed frustration over delayed software updates. In recognition of its impact, the Redmi Note 4 was named the "Best Budget Smartphone" of 2017 by Stuff and also won in the budget category at the Digit Zero1 Awards, underscoring its influence in the Indian market.

Sales and market impact

The Redmi Note 4 achieved significant commercial success, with global sales exceeding 20 million units by late , as announced by CEO regarding the closely related Redmi Note 4X variant. In , the device sold approximately 9.6 million units in 2017 alone, making it the best-selling in the country that year according to firm . These figures underscored its rapid adoption in emerging markets, particularly through flash sales on platforms like and Mi.com, where initial batches sold out in minutes. The device's strong performance significantly boosted Xiaomi's presence in the budget smartphone segment, elevating the company's overall in to around 21% for the full year of 2017, per data. This surge was driven by the Note 4's competitive pricing and metal unibody design, which pressured rivals like and to introduce similar premium-feeling builds at lower price points in the sub-$200 category, intensifying competition in the market. As a foundational model, the Redmi Note 4 established the Redmi Note series as one of Xiaomi's flagship lineups, contributing to the series surpassing 100 million global units sold by 2019. Official software support ended in April 2019 with the final MIUI update based on 9, but an active developer community on XDA Forums has sustained its usability through custom ROMs like up to , allowing users to extend the device's functionality into 2025 and beyond. This paved the way for successors such as the , launched in early 2018 with upgrades including a Snapdragon processor and improved 12-megapixel rear camera for better low-light performance.

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