ZTE F40 5G RedCap Portable WiFi Simple Unboxing Review

Industry Exchange Product Review & Teardown
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ZTE F40 5G RedCap Portable WiFi: Quick Unboxing Review

I bought this portable WiFi to replace the Huawei 4G portable WiFi I’ve been using for nearly 10 years.

Introduction

Product Overview

The ZTE F40 is a 5G RedCap lightweight portable Wi-Fi device launched by ZTE on January 13, 2026. It features a USB flash drive-like portable design, focuses on great value and low power consumption, and offers two options: a dual-network version (with built-in eSIM) and a SIM card version (supports nano-SIM).

Specifications

Category Parameter Details
Mobile Network Parameters Frequency Bands 5G: n1/3/5/8/28/41/78
WLAN Features Wireless Standard IEEE 802.11a/b/g/n/ac/ax (Wi-Fi 6)
WLAN Features Supported Bands 2.4GHz or 5GHz (1×1)
WLAN Features Max Connections 16 devices
Interface Interface Type USB-A & USB-C Dual Interface
Physical Specifications Dimensions 104mm × 34mm × 11mm
Physical Specifications Weight Approx. 34g
Package Contents Standard Accessories F40 host ×1, activation insert ×1

This product has built-in 5G dual-SIM (China Mobile + China Telecom), uses 5G RedCap technology, reduces power consumption by 10-20% compared to full 5G, increases speed by 50% compared to 4G, and reduces latency by 70%.

ZTE F40 supports dual-band Wi-Fi 6, up to 16 device connections, provides dual USB interfaces, supports both USB tethering and WiFi modes, and is equipped with visual indicator lights to conveniently view connected network provider information.

Purchase Links

What is 5G RedCap: The “Youth Edition” Network Technology for 5G Portable WiFi

5G RedCap (full name Reduced Capability, translated in Chinese as “Lightweight 5G” or “Reduced Capability 5G”) is a streamlined 5G technology introduced by 3GPP in the R17 standard, affectionately called “Little Red Cap” by the industry, positioned between traditional 5G eMBB (Enhanced Mobile Broadband) and low-rate mMTC (massive Machine-Type Communications), designed for medium-to-high speed, low-cost, low-power application scenarios.

Core Technology Features

RedCap achieves a “just enough” balance through precise capability trimming:

  • Bandwidth Reduction: Sub-6GHz band reduced from 100MHz in full 5G to 20MHz, lowering hardware complexity
  • Antenna Simplification: Reduced from 4T4R to 1T1R or 1T2R, decreasing RF chains and lowering power consumption
  • Modulation Downgrade: Uniformly uses 64QAM (full 5G supports 256QAM), reducing terminal processing pressure
  • Protocol Optimization: Simplified control channel design, shortened connection establishment time, improved standby efficiency

Comparison with Full 5G (Focus on Portable WiFi Scenarios)

Comparison Dimension 5G RedCap Full 5G (Flagship Phone) Impact on Portable WiFi
Peak Rate Downlink approx. 150Mbps, uplink approx. 50Mbps Downlink 1-10Gbps, uplink 500Mbps+ Satisfies daily web browsing, video, light office work; does not support 8K ultra-HD streaming
Maximum Bandwidth Sub-6GHz: 20MHz Sub-6GHz: 100MHz, mmWave: 200MHz Cost reduced by 30%-50%, device is more compact and portable
Antenna Configuration 1T1R/1T2R 4T4R/8T8R Power consumption reduced by approx. 40%, extending battery life
Supported Bands Only Sub-6GHz (mainstream 5G bands) Sub-6GHz + mmWave More comprehensive coverage, no need to worry about mmWave band compatibility issues
Terminal Cost Greatly reduced (module price around hundred-yuan level) Higher (flagship chip thousand-yuan level) Drives portable WiFi prices down to under 200 yuan

Why It’s Suitable for Portable WiFi

RedCap is a “just right” technical choice for portable WiFi products:

  1. Cost Advantage: Module price is greatly reduced, directly lowering the overall device price, turning 5G portable WiFi from a high-end product into a mass-market consumer product
  2. Power Consumption Balance: Significantly reduces power consumption while ensuring hundred-megabit speeds, extending battery life and reducing charging frequency
  3. Adequate Experience: 150Mbps downlink speed is sufficient to support daily scenarios like 4K video, online gaming, and remote work, with little practical difference from full 5G
  4. Strong Compatibility: Supports core 5G features like network slicing and low latency, while maintaining backward compatibility with 4G networks to ensure continuous coverage

Application Prospects

Besides portable WiFi, RedCap is also widely applicable in scenarios like video surveillance, industrial sensors, wearable devices, and vehicle communication, becoming one of the key technologies driving large-scale 5G adoption. With the refinement of the R18 standard, RedCap speeds will further improve while maintaining cost advantages, providing possibilities for more smart devices to connect to 5G networks.

Unboxing

Front of Package

Back of Package

Side of package, printed with device information: 5G wireless data terminal, model MU3650, also includes CMIIT ID, IMEI, SN, device number, etc. The device number is used to bind the device in the ZTE Portable WiFi WeChat official account to recharge the built-in IoT card.

When opening the box, the first thing is a quick start guide.

Removing that guide reveals the ZTE F40 portable WiFi underneath, shaped like a large USB flash drive with semi-circular ends.

Lifting the cover reveals a nano-SIM card slot and reset button, along with a sticker printed with device information.

In addition to the USB-A port, there’s also a Type-C port on the other end that can also be used for power/data.

Review

Network Speed Test

Location: In a room at a tech park in Guangming District, Shenzhen

Telecom 5G

Network information shown below: signal strength -91dBm, band NR BAND 1 (abbreviated as n1, 2.1GHz), signal strength is weak.

Left side is F40 portable WiFi: download 41Mbps, upload 79Mbps;

Right side is Huawei Mate70Pro+: download 330Mbps, upload 53Mbps.

Mobile 5G

Network information shown below: signal strength -85dBm, band NR BAND 28 (abbreviated as n28, 700MHz), signal strength is average.

Mobile 5G, measured using USTC speed test server: download 22.7Mbps, upload 14.1Mbps.

Telecom 4G

Network information shown below: signal strength -85dBm, band 2100MHz (B1), signal strength is average.

Telecom 4G, measured using USTC speed test server: download 49.9Mbps, upload 45.1Mbps.

Mobile 4G

Network information shown below: signal strength -86dBm, band 2600MHz (B41), signal strength is average.

Mobile 4G, measured using USTC speed test server: download 44.3Mbps, upload 7.28Mbps.

WiFi Maximum Speed

The maximum negotiated WiFi speed for both 2.4GHz and 5GHz bands is around 286Mbps; both bands cannot be enabled simultaneously, only one can be selected.

Power Consumption Test

Switched to Telecom 5G network, connected one WiFi device: power consumption is around 0.9W when idle; around 2.4W when running network speed tests. Power consumption is indeed quite low.

Data Plan Pricing

The version I purchased has 2 built-in data cards and can also accept one additional SIM card. The two built-in cards are Telecom and Mobile, sharing one data plan with free network switching - very convenient.

1.5TB monthly data, annual package 699 yuan (approx. 58 yuan/month), monthly package 79 yuan/month - not bad pricing. (My current home broadband is 300Mbps at 100 yuan/month)

Management Interface

Management home page: displays basic device and network information, allows quick card switching.

Device information page: displays cellular network details including band, signal strength, frequency point, cell ID, etc.

Security settings page: can enable UPnP, DMZ.

WiFi settings page: 2.4GHz and 5GHz can only have one enabled at a time.

Developer options page: can set country/region code, can lock frequency. (Frequency locking forces connection to specified 4G/5G bands to avoid congestion/interference, stabilize speed, reduce frequency hopping lag, and improve rates.)

5G Band (NR) Comparison Table| Band Number | Frequency Range | Peak Rate and Bandwidth | Domestic Commercial Operator | Characteristics and Typical Scenarios |

| :----------: | :-------------------------------------------: | :---------------------------: | :-----------------------------: | :----------------------------------------------------------: |
| n1 | 1920-1980 MHz (Uplink)
2110-2170 MHz (Downlink) | ~400-600 Mbps (based on 40MHz) | China Unicom, China Telecom (Joint Construction and Sharing) | FDD mid-band. Balanced coverage and capacity, with significant uplink coverage advantage, commonly used for continuous urban coverage and as a blind spot supplement for high-frequency bands (like n78). |
| n3 | 1710-1785 MHz (Uplink)
1805-1880 MHz (Downlink) | ~300-450 Mbps (based on 30MHz) | China Unicom, China Telecom | FDD mid-band. Refarmed from a premium 4G frequency, offering strong penetration and providing good wide-area coverage and deep indoor coverage. |
| n5 | 824-849 MHz (Uplink)
869-894 MHz (Downlink) | ~150-200 Mbps (based on 20MHz) | China Telecom | FDD low-band. Low signal attenuation, extremely wide coverage per base station, mainly used for remote areas, highways, or deep indoor coverage like basements. |
| n8 | 880-915 MHz (Uplink)
925-960 MHz (Downlink) | ~150-200 Mbps (based on 20MHz) | China Mobile, China Unicom | FDD low-band. Traditional “golden frequency band,” extremely strong diffraction capability, commonly used for rural wide-area coverage, maritime coverage, and as a foundational network for IoT (RedCap, etc.). |
| n28 | 703-748 MHz (Uplink)
758-803 MHz (Downlink) | ~350-450 Mbps (based on 30/40MHz) | China Broadcasting Network, China Mobile (Joint Construction and Sharing) | FDD low-band (700MHz). Extremely low propagation loss and very wide coverage. Main driver for China’s 5G penetration into lower-tier markets, also commonly used for VoNR voice services. |
| n41 | 2515-2675 MHz | ~1.5 Gbps+ (based on 100/160MHz) | China Mobile | TDD mid-high band. Core 5G band for China Mobile. Balances good coverage range with extremely high rate capacity, used for continuous coverage in cities, counties, and main roads. |
| n78 | 3300-3600 MHz | ~1.5-1.7 Gbps+ (based on 100MHz) | China Telecom, China Unicom, China Broadcasting Network | TDD mid-high band (3.5GHz). Globally mainstream 5G band. Extremely large bandwidth, primarily serves high-throughput needs in high-density urban hotspots (commercial districts, office areas, universities). |

4G Frequency Band (LTE) Comparison Table

Band Number Frequency Range Peak Rate Domestic Commercial Operator Characteristics and Typical Scenarios
B1 1920-1980 MHz (Uplink)
2110-2170 MHz (Downlink)		 ~150 Mbps (Single Carrier 20MHz) China Unicom, China Telecom FDD primary band. Refarmed from the original 3G core frequency, higher frequency band, mainly used for basic 4G capacity coverage in large and medium-sized cities and high-traffic areas.
B3 1710-1785 MHz (Uplink)
1805-1880 MHz (Downlink)		 ~150 Mbps (Single Carrier 20MHz) China Unicom, China Telecom, China Mobile FDD core primary band. The most widely used 4G band globally, backbone carrier of 4G networks, balancing coverage and speed.
B5 824-849 MHz (Uplink)
869-894 MHz (Downlink)		 ~75 Mbps (Single Carrier 10MHz) China Telecom, China Unicom FDD low-band. Long propagation distance, mostly used for rural wide-area coverage and low-rate device access like NB-IoT (Narrowband Internet of Things).
B8 880-915 MHz (Uplink)
925-960 MHz (Downlink)		 ~75 Mbps (Single Carrier 10MHz) China Mobile, China Unicom FDD low-band. Refarmed from 2G/3G, providing deep indoor coverage (elevators, underground garages) and VoLTE voice assurance in remote areas.
B28 703-748 MHz (Uplink)
758-803 MHz (Downlink)		 ~150 Mbps (Single Carrier 20MHz) China Broadcasting Network (partially shared with Mobile) FDD low-band. Mainly provides extremely wide-area 4G signal coverage in some remote areas, forest regions, or sea surface areas.
B34 2010-2025 MHz ~50 Mbps (Single Carrier 15MHz) China Mobile TDD band. Refarmed from the original TD-SCDMA. Narrow bandwidth, mainly used as supplementary hotspot capacity or IoT access.
B38 2570-2620 MHz ~100 Mbps (Single Carrier 20MHz) China Mobile TDD high-band. High attenuation but good anti-interference, mainly used for capacity absorption in dense urban hotspot areas (train stations, pedestrian streets).
B39 1880-1920 MHz ~100 Mbps (Single Carrier 20MHz) China Mobile TDD primary band. Relatively moderate frequency, balancing a certain coverage and capacity, commonly used for urban continuous coverage and indoor distribution systems.
B40 2300-2400 MHz ~100 Mbps (Single Carrier 20MHz) China Mobile, China Telecom, China Unicom TDD indoor band. Domestic operators mainly use it for indoor distribution systems. Commonly used in enclosed high-traffic spaces like shopping malls and subways.
B41 2515-2675 MHz ~300 Mbps+ (Multi-Carrier Aggregation) China Mobile, China Telecom, China Unicom TDD core high-capacity band. Extremely rich resources, often providing ultra-high 4G speeds through Carrier Aggregation (CA), primarily serving extreme high-traffic scenarios in dense urban areas.

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English Version of the Article: https://blog.zeruns.top/archives/87.html