D-Link G403C Review

Quick Summary

The G403C is D-Link's compact 4G LTE Wi-Fi router, a plug-in-a-SIM-and-go device for places where there is no broadband line, or where you want a backup for one. It shares a 4G mobile connection of up to 150 Mbps over a single 2.4 GHz Wi-Fi band. At around ₹2,699 on Flipkart it is inexpensive. The strengths are simple setup and WAN failover; the compromises are slow Fast Ethernet ports and Wi-Fi that is limited to the older 2.4 GHz band.

Design & Build Quality

The G403C is a white desk router with four fixed external antennas: two for Wi-Fi and two for the mobile signal. The antennas are listed at 5 dBi, which is helpful for pulling in a mobile signal in a weak area. Buttons for power, WPS and reset, and a row of status lights for the internet, LAN, 4G and Wi-Fi, keep the housing simple to read at a glance.

Mobile Network & Everyday Performance

This is a 4G LTE Cat 4 router, which means a top download speed of up to 150 Mbps and upload of up to 50 Mbps if your operator's signal supports it. Real speeds will depend on your SIM, your operator and your location, not on the router alone. Support covers a wide spread of LTE bands, including B3, B5, B40 and B41, with 3G fallback if the 4G signal drops. Wi-Fi is limited to the 2.4 GHz band at up to 300 Mbps. That is plenty for browsing, video calls and social media, and it suits a small group of devices; D-Link says up to 32 devices can connect at once. It is not built for crowded networks or for fast local file transfers.

Wired Connections

The G403C has three Fast Ethernet LAN ports and one Fast Ethernet WAN/LAN port. Fast Ethernet means 100 Mbps per port, which is below Gigabit. Because the mobile connection tops out at 150 Mbps this is rarely a bottleneck, but it will limit the router if you attach it to a faster wired broadband line as a backup.

Software, Features & Backup

The standout feature is WAN failover. If your main broadband goes down, the router can switch to the 4G connection automatically, then switch back when the main line returns. That makes it a handy safety net for work-from-home setups, small shops and CCTV systems. Management is through a web interface rather than a phone app. A guest Wi-Fi network is available, and the firewall covers the basics: stateful packet inspection, anti-spoofing checks, IP and MAC filtering, port forwarding and DMZ.

Security

The G403C supports WPA3 encryption, and D-Link lists EN 18031 and IEC 62443-4-1 security certifications. The router is also MTCTE certified, which is required for telecom equipment sold in India.

Features Assessment

For its price, the feature set is sensible: SIM-based setup, WAN failover, a guest network and a proper firewall. It lacks the extras that cost more, such as dual-band Wi-Fi, Gigabit ports, mesh support or an app. The router does what it says and does not pretend to be more.

Ease of Use

Setup is the easiest part. Insert a Nano SIM, power the router on and connect to the Wi-Fi. There are no cables to run and no technician to call. Advanced settings are available in the web interface, which will feel familiar to anyone who has configured a router before. Remember that you need an active data plan on the SIM, and heavy use will depend on how much data that plan allows.

Value for Money

At around ₹2,699 on Flipkart, the G403C is priced like a basic router but does something most basic routers cannot: it connects to the Internet through a SIM. That makes it good value as a backup link or as the main connection in a home without broadband. The running cost depends on your data plan, which is a bigger expense than the hardware over time.

Who Should Buy It?

People without a wired broadband connection, small shops and offices that want a backup line, and anyone setting up CCTV or a temporary connection at an event will find the G403C a straightforward answer. It works best for a handful of devices doing everyday tasks.

Who Should Consider Alternatives?

Households with many devices, or users who need 5 GHz Wi-Fi, Gigabit ports or a phone app should look at a dual-band Wi-Fi 6 router, with a separate 4G backup if needed. If you want 5G, this model does not offer it.