MERCUSYS MT110 — Affordable 4G LTE mobile Wi-Fi router

Overview

The MERCUSYS MT110 is an entry-level 4G LTE mobile Wi-Fi router that works as soon as you insert a Nano SIM. The short verdict: you buy this for low cost and simplicity, not for speed.

Wi-Fi is 802.11n on 2.4GHz only, capped at 150Mbps, with up to 10 simultaneous clients.

That makes it less a streaming device and more an insurance policy — mail, chat, maps, and light video calls that keep working wherever you are.

In this price class, complaints usually cluster around unsupported LTE bands, APN setup, and battery life — not raw throughput.

Compatibility Guide

The MT110 takes a Nano SIM. If you only hold a microSIM or full-size SIM, request the right size from your carrier or use an adapter; cutting a SIM down risks damaging the contacts.

There is no eSIM support, so an eSIM-only plan will not work here without a physical SIM.

Band support is quad-band, covering the major Japanese bands B1/B3/B5/B8 and similar per the published specs. This is where most buyers get burned.

Japanese carriers use different band mixes under the same "4G LTE" label, and if a low band your area depends on is missing, you can lose signal indoors or in rural areas. Check which bands your plan actually uses before buying, and confirm the official band table on the manufacturer's product page — this is not something to assume.

On the Wi-Fi side you get 2.4GHz 802.11n (up to 150Mbps) and nothing else.

2.4GHz travels further and penetrates walls better, but it shares space with Bluetooth devices, microwaves, and every neighbouring access point.

In a crowded hotel or cafe, the Wi-Fi link can be the bottleneck even when LTE is healthy. That is a property of the standard, not a defect: reduce connected devices or move closer to the unit.

There is no Ethernet port. If you need to feed a desktop PC or a wired-only device, this router alone will not meet the requirement.

Power comes from an internal battery charged over the bundled USB cable. You can run it from a power bank while in use, but charging and transmitting together generates heat, so avoid leaving it in a hot car for long stretches.

Product Info

Core specifications, unchanged from the published data:

Check the retailer's page for the latest price. The ASIN is B0CTGP557X, with RAREWAVES-JP shown as both seller and shipper.

Prices move constantly with sales, exchange rates, and seller rotation, so treat that figure as a snapshot and check the product page for the current price.

On paper, a little over ¥11,000 looks steep for a 150Mbps, 2.4GHz-only device — bundled data-included pocket Wi-Fi units sit in similar territory.

The MT110's real value is that it is SIM-free: you pick the carrier, swap to a cheaper MVNO plan, or drop in a local prepaid SIM abroad. Bundled units give you none of that freedom.

A three-year defect warranty fits that buy-once, keep-it-for-years pattern.

How It Compares

Mobile routers fall into three tiers. First, SIM-free 4G entry units like this one.

Second, contract-free pocket Wi-Fi that ships with data included. Second-tier products are the right answer if you never want to think about bands or APNs, but you cannot choose the carrier and your options run out when the data does.

Third, 5G units with Wi-Fi 6 and Ethernet — far faster, far more expensive, and overkill for staying reachable. The MT110 targets the middle ground: people who want to choose their own line and are genuinely fine below 150Mbps.

Best Use Cases

• Frequent business travellers — skip shared hotel and airport Wi-Fi and run your own SIM. Setup is inserting the card and entering an APN.
• Anyone wanting a backup line — a spare for when home broadband drops, or to avoid draining a phone through tethering. Occasional use is exactly where a cheap buy-once unit makes sense.
• MVNO users — pair it with a data-only budget SIM to keep monthly costs minimal.
• Small groups — up to 10 clients covers a few laptops, phones, and tablets, provided they are not all streaming at once.

It is the wrong choice if you need 5G speeds, heavy concurrent throughput, a wired port, or 5GHz Wi-Fi. In those cases a higher tier unit is cheaper in the long run.

Before You Buy

1. 150Mbps is a theoretical ceiling. It is the 802.11n 2.4GHz maximum, and real throughput is typically well under half of it.

LTE-side speed depends on your carrier, the time of day, and signal quality. Buying this expecting 150Mbps will disappoint you.

2. Band mismatch is the biggest pitfall. Quad-band does not mean every carrier in every location.

If you plan to use it underground, indoors, or outside major cities, verify your carrier's bands first. Unverified purchases followed by "no signal" complaints are a recurring pattern with this product class.

3. Treat overseas use as "might work." A local prepaid SIM can work, but LTE band layouts differ by country.

If the destination's bands do not overlap with this device's, it is dead weight in your bag. For travel-first use, pick a router that publishes explicit international band coverage.

4. Watch the listing details. MERCUSYS makes the device while RAREWAVES-JP sells and ships it — a normal marketplace arrangement, not a red flag in itself.

But Amazon listings sometimes carry incorrect registration data or mixed-up photos and specs. Confirm from the title, images, and model number that you are looking at an MT110.

Parallel-import stock may also carry different domestic support and warranty terms.

**5. Runtime will shorten over the years and the unit is not designed for battery replacement. For long-term use, plan on running it powered in a fixed spot as an option.

6. A 4.1 out of 5 with 82% favourable (captured 28 August 2026) is fine, but a small sample moves easily.

Read what the low scores object to rather than weighting the average.

FAQ

Q. Does it support eSIM?
A. No. A physical Nano SIM is required. An eSIM-only plan will need to be switched to a physical card.

Q. Can I connect over 5GHz Wi-Fi?
A. No. The MT110 broadcasts on 2.4GHz only. Devices locked to 5GHz will need their settings adjusted.

Q. Can I plug in a PC over Ethernet? A.

Not with this unit — there is no Ethernet port. Choose a higher-tier model if wired access is a requirement.

Q. Is 10 devices realistic? A.

They can all connect, but they share the same 150Mbps ceiling. Several phones browsing and messaging is fine; several people streaming video is not.

Q. Which SIM should I choose? A.

A data-only budget SIM is fine. Bands matter more than price — cross-check the manufacturer's band table against your carrier's coverage information before committing.

Q. What does it cost? A.

¥11,135 on Amazon JP as captured on 28 August 2026. Prices fluctuate significantly, so confirm the current figure on the product page.

Product Disclosure (Amazon)

• Manufacturer: MERCUSYS
• Seller: RAREWAVES-JP
• Fulfilled by: RAREWAVES-JP
• ASIN: B0CTGP557X
• Note: This article covers a manufacturer-made product based on Amazon listing details.