WF40 Wi-Fi USB Dongle for Yealink IP Phones - Reliable Wireless 150

In this review the WF40 Wi-Fi USB Dongle is assessed as a budget-friendly way to add wireless connectivity to supported Yealink IP phones. It is best suited for small offices or reception desks that need a simple plug-and-play solution instead of running Ethernet to every handset. The single biggest reason to buy is straightforward: it can turn compatible phones into wireless devices quickly, delivering up to 150 Mbps over 2.4 GHz with modest power use, making it an appealing accessory where convenience and cost matter more than advanced enterprise features.

Key Features

• Plug and play: The dongle is ready to use with supported phones after a firmware upgrade, letting administrators add wireless without complex configuration.
• 150 Mbps transmission: The 2.4 GHz, IEEE802.11b/g/n radio provides a high transmission rate for voice traffic on small networks.
• Low power consumption: Designed to draw less power from the phone USB port, it keeps handset battery and power budgets modest.
• Security options: Supports WEP and WPA-PSK/WPA2-PSK encryption to secure SIP voice traffic on shared Wi-Fi networks.
• Compact form factor: The small USB 2.0 adapter is unobtrusive and easy to place on a desk or behind a phone without blocking other ports.

Who It's For

The WF40 is aimed at small businesses, front desk staff, and remote workers who use compatible Yealink handsets such as T27G, T29G, T46G, T48G and the T4xS series and need a quick wireless option. IT teams who prefer a low-cost, easily replaceable adapter rather than rewiring an office will appreciate how simple it is to deploy on phones once the phone firmware requirement is met.

It is not ideal for large call centers or environments that require dual-band 5 GHz support, advanced QoS features, or guaranteed enterprise Wi-Fi performance. Buyers who need broader compatibility with non-Yealink devices or higher throughput should look for a purpose-built wireless gateway or access point solution instead.

Pros & Cons

Pros

• Easy installation and real plug-and-play use on supported phones after the required firmware update.
• Good value for basic wireless voice connectivity at up to 150 Mbps on 2.4 GHz.
• Small size and low power draw make it unobtrusive for desktop phone setups.
• Supports common encryption standards to help protect call data on Wi-Fi.

Cons

• Compatibility is mixed in practice; some customers report it failed with certain phones or needed specific firmware versions.
• Limited to 2.4 GHz and 150 Mbps, so it will not meet needs that require 5 GHz or higher throughput.

Specifications

Network Standard	IEEE802.11b/g/n
Transmission Rate	150 Mbps
Frequency Range	2.4 GHz
Security	64/128/152-bit WEP, WPA-PSK, WPA2-PSK
Interface	USB 2.0
Dimensions	26.9 mm x 18 mm x 8 mm
Operating Temp	0C to +50C (32F to 122F)

Our Verdict

The WF40 Wi-Fi USB Dongle is a practical, low-cost adapter for users who need to add wireless connectivity to supported Yealink IP phones quickly. It offers good value where ease of installation, basic security, and moderate throughput are the priorities, but buyers should check firmware compatibility and avoid it for environments that demand 5 GHz or enterprise-grade wireless performance.

Frequently Asked Questions

Will this work with my Yealink T48G?
It will work with T48G series phones once the phone firmware is upgraded to the recommended version or higher; confirm your phone firmware before purchase.

What speed and band does it use?
The dongle operates on 2.4 GHz with a maximum transmission rate of 150 Mbps using IEEE802.11b/g/n.

Does it support secure Wi-Fi?
Yes, it supports WEP and WPA-PSK/WPA2-PSK encryption to protect voice traffic on the wireless network.