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Product guide

MERCUSYS MB135-4G AC1200 4G LTE Router

AC1200: MERCUSYS MB135-4G is a dual-band 4G LTE router with a SIM slot and Ethernet connectivity. Its listed Wi-Fi rate is 1200 Mbps, while the listing states 4G download speeds up to 150 Mbps, so mobile-network performance remains dependent on the available connection.

At a glance

A SIM card provides the listed 4G internet connection, with Ethernet also available for router mode.
Dual-band Wi-Fi is specified at up to 300 Mbps on 2.4 GHz and 867 Mbps on 5 GHz.
The listing claims support for up to 64 Wi-Fi devices and describes four external antennas.
App and push-button control methods are listed, alongside guest mode, parental controls and QoS.

Price

£44.64Save 26%

Reference price: ~~£59.99~~

Price checked: 12 Nov 2026

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Pros and cons

Pros

Combines SIM-based 4G connectivity with Wi-Fi and Ethernet, giving buyers more than one stated way to connect.
The stated dual-band Wi-Fi rates and capacity claim suit households sharing a connection across multiple devices.
The listed Ethernet cable and power adapter mean the stated core accessories are accounted for in the manufacturer contents list.

Cons

4G download speeds are listed up to 150 Mbps, which is a practical ceiling to weigh against higher-speed fixed broadband needs.

Technical specifications

23 specifications

Identity
Brand	MERCUSYS
Model	AC1200 Wireless Dual Band 4G LTE Router
Model number	MB135-4G
Colour	Black

Network and wireless
Wireless connection listed	4G, Wi-Fi, Ethernet
Wi-Fi band class	Dual-Band
Wireless standards	802.11a, 802.11ac, 802.11b, 802.11g, 802.11n
Wi-Fi generation	Wi-Fi 5
Combined Wi-Fi data rate listed	1167 Megabits Per Second
Maximum 4G download speed listed	150 Mbps
Wi-Fi speed on 2.4 GHz	300 Mbps
Wi-Fi speed on 5 GHz	867 Mbps
Maximum upstream data transfer rate listed	300 Megabits Per Second
Maximum connected Wi-Fi devices claimed	64
Security protocols	WPA-PSK, WPA2-PSK

Ports, features and controls
Number of ports listed	4
LAN port bandwidth listed	1000 Mbps
Control methods listed	App, Push Button
Special features listed	Guest Mode, Internet Security, Parental Control, QoS
Alternative wired-router mode	When 4G isn’t available, the portable wifi router can also be used by connecting an Ethernet cable to the LAN/WAN port for flexible internet access

Antennas and physical details
Antenna type listed	Retractable
Weight listed	0.28 Kilograms
Dimensions	21.9L x 14W x 3.2H centimetres

What to know before buying

Listing details to confirm

The listing gives several wireless-rate figures: 1167 Megabits Per Second overall and 300 Mbps plus 867 Mbps by band, while its title calls the router AC1200. It also says “detachable LTE antennas” in the title but “Retractable” in the antenna details, and specifies four ports without identifying their individual types beyond a LAN/WAN mention. Confirm antenna configuration and port layout for your setup. The 150 Mbps 4G download figure is a listing maximum, not a guaranteed speed. The manufacturer also describes plug-in SIM use, but does not identify supported network bands or operators here.

What’s in the box

Included

AC1200 Wireless Dual Band 4G LTE Router (MB135-4G)
Power adapter
RJ45 Ethernet cable

Who is it for?

A good fit for

People seeking a SIM-based 4G connection with dual-band Wi-Fi for home, travel or a location without dependable fixed broadband.
Households that want to connect multiple Wi-Fi devices and retain an Ethernet connection option.

Less suited to

Buyers who need a confirmed 5G cellular router or require guaranteed mobile download speeds above the stated 4G maximum.
Anyone who needs clearly specified individual port types or confirmed removable rather than retractable antennas before purchase.

MERCUSYS MB135-4G AC1200 4G LTE Router · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.4 / 5 · 9,735 ratings

5 stars74%74%
4 stars10%10%
3 stars5%5%
2 stars3%3%
1 star8%8%

Customer feedback highlights straightforward setup and perceived quality, with some customers appreciating portability and signal strength. Reports on speed and signal quality are mixed, including both faster-than-broadband experiences and reports of 6–12 Mbps or unreliable connections. The router’s stated 4G download ceiling is up to 150 Mbps, but that does not predict the result at a particular location, so buyers relying on it for broadband should consider local mobile coverage and the mixed stability reports.

Positive themes

Customers describe setup as easy and the router as working straight out of the box.
Some customers praise its portability and signal strength.

Mixed feedback

Customer reports on speed and signal quality vary, with some describing fast performance and others reporting low speeds or unreliable connections.

Frequently asked questions

Does the MB135-4G use a SIM card for internet access?

Yes. The listing describes inserting a SIM card for 4G connectivity. It does not specify supported mobile operators or network bands, so check compatibility with your SIM provider.

What Wi-Fi speeds does the listing give?

It lists up to 300 Mbps on 2.4 GHz and 867 Mbps on 5 GHz, as well as 1167 Megabits Per Second overall. These are stated Wi-Fi rates, not a promise of internet throughput.

Can it be used without a 4G connection?

The listing says it can operate in Wi-Fi router mode by connecting an Ethernet cable to the LAN/WAN port when 4G is unavailable.

How many devices can connect?

The listing claims support for up to 64 Wi-Fi devices. Actual performance depends on conditions and usage.