4G, 5G and 5 GHz: a router buying guide for Sri Lanka

Think about two connections

The first connection brings internet service to the router. Depending on your setup, that might involve a mobile SIM or an existing fixed-broadband connection. The second connects your devices to the router, using Wi-Fi or a supported cable connection. Identify which of these you are trying to improve.

As a shopping example, a family adding wireless coverage to an existing broadband setup has different requirements from someone buying a SIM-based router for a new location. Tell the seller which setup you have before asking which router to buy.

Read 5G and 5 GHz as separate specifications

In a mobile-network specification, 4G and 5G refer to cellular technologies. In Wi-Fi specifications, 2.4 GHz and 5 GHz refer to radio bands used between Wi-Fi devices. TP-Link’s Wi-Fi explanation discusses those bands; its cellular-router documentation lists mobile-network capability separately.

A dual-band Wi-Fi label describes Wi-Fi capability, not proof of 5G cellular support. Ask for the exact model number and manufacturer specification if a listing uses “5G” ambiguously. Do not infer network support from the product’s appearance, antennas or headline.

• Mobile-network field: look for the supported cellular technologies and bands.
• Wi-Fi field: look for the supported Wi-Fi bands and standards.
• Ports field: identify the connections needed for your existing setup.

Check the service at the intended location

Before purchasing a SIM-based router, ask your operator about compatibility with the exact device and the plan you intend to use. Check current coverage information for the actual address. Availability at a nearby landmark is not the same as a performance promise inside your room.

Ask whether the device is restricted to a particular operator and whether configuration details are required. Keep these answers separate from the seller’s general speed headline. This guide does not promise a particular speed or coverage level for any Sri Lankan network.

Describe the problem before replacing equipment

Write down where the connection is inconvenient: one room, the whole property, or only particular devices. Note where the existing router sits and how the affected devices connect. This makes a support conversation more productive than saying only that the internet is slow.

For fixed-broadband setups, check with your provider before replacing supplied equipment or changing how it is connected. You may be shopping for an additional wireless access point rather than a complete replacement for the provider’s device. Confirm the required operating mode and ports for your setup.

Keep a comparison sheet with unknowns visible

Compare exact model numbers, required service, supported network bands, Wi-Fi capabilities, ports, power adapter, setup support and current warranty terms. Leave unverified fields blank. A short list of unanswered questions is better than treating a broad product title as a technical specification.

• Internet source and intended operator or provider identified.
• Exact model and manufacturer specification obtained.
• Required service and device compatibility confirmed.
• Power supply, ports and setup support checked.