Router with SIM card: home 4G routers, pocket MiFi and which SIM to put in them

What is a router with a SIM card?

A router with a SIM card takes a mobile data SIM instead of a phone line or fibre, and shares that connection over Wi-Fi. There are two kinds. A home 4G or 5G router sits on a shelf, runs off the mains and handles many devices. A pocket MiFi (also sold as a mobile hotspot or "SIM card hotspot device") runs on a battery and goes in a bag.

We read the spec pages for three common models on 10 November 2026:

Two things stand out. The Huawei takes a micro SIM, not the nano size most phones use, so check the slot before you buy a SIM (most SIMs now come in a punch-out frame with all three sizes; our SIM card sizes guide explains them). And none of the three spec pages we read lists eSIM support, so a downloaded travel eSIM will not go in any of them.

This is desk research from the manufacturers' and operators' own pages. We have not bought or tested these routers or plans.

Home 4G router or pocket MiFi: which do you need?

Pick on where you will use it.

Home 4G/5G router

for a house, holiday let, caravan or office without fixed broadband, or as a backup. TP-Link says the MR600 can also act as a backup when set up as a wireless router, and lists WAN failover. It is "plug a SIM card and play", with no configuration needed, according to TP-Link. Battery power is not an option

Pocket MiFi

for trips, commuting, or sharing one data plan between a laptop and a tablet. TP-Link markets the M7350 for business trips, road travel and the outdoors. Battery life is the limit: TP-Link quotes up to 8 hours of use for the M7350

If what you actually want is a "hotspot with SIM card" for one trip, your phone may already be that device. Most phones can share their data as a personal hotspot, which costs nothing extra in hardware.

What SIM card or data plan should go in a router?

A data-only SIM is the usual choice. It has no calls or texts to pay for, and operators sell them for exactly this use. Three, for example, says its pay as you go Data Only SIMs are for tablets, laptops, MiFi and other mobile broadband devices. When we read Three's page on 10 November 2026 it listed:

Three flagged the 120GB pack as a "Don't miss this deal" offer with no end date. It says the SIM must be activated in the UK before you travel, and that an unused SIM is deactivated 18 months after the pack ends. More options are in our data-only SIM card guide.

Things to check before you buy any SIM for a router:

Size

• nano or micro
• as above

Device use allowed

some unlimited phone plans restrict tethering or use in a router. Read the fair-use terms. Three's community moderators note they cannot always guarantee support if a SIM is used in a device it isn't intended for

SIM PIN

a router may not be able to enter a SIM PIN for you. Removing the PIN in a phone first is the simple fix: on an iPhone, Apple puts it under Settings, Cellular, SIM PIN

Bands

the router has to support the frequency bands of the network you use. Band lists are on each spec page

Unlocked or carrier-locked: does it matter?

Yes. A router or MiFi bought from a mobile operator may be locked to that operator's network, which means another company's SIM will not work in it. If you buy from a retailer, check the listing says unlocked: TP-Link's own spec pages for the MR600 and M7350 do not say either way, and TP-Link claims the MR600 works with SIMs in more than 100 countries based on its field tests.

If a device is locked, only the network that sold it can unlock it. Vodafone UK, for example, says its network unlock code (NUC) is requested through an online form and that unlocking a Vodafone phone or SIM is free. In the UK, Ofcom's ban on operators selling locked mobile phones was announced in October 2020 to take effect in December 2021; we could not load Ofcom's own page on 10 November 2026 to check whether the rule extends to routers and MiFi, so ask the seller.

Can you use a SIM card router abroad?

You can, with two catches.

Roaming on a home SIM. A UK data-only SIM in a MiFi roams like any other SIM, under that operator's roaming rules. On Three's PAYG data packs above, the roaming allowance is much smaller than the UK one, at 1GB or 2GB a month.

Buying a local SIM. A local prepaid data SIM is often the cheapest data abroad, and an unlocked MiFi takes it without fuss. This is the classic pocket Wi-Fi model, which our pocket Wi-Fi vs eSIM page compares in detail.

When is a travel eSIM on your phone better than a MiFi?

For most short trips. A travel eSIM installs on the phone you already carry, and the phone can then act as a hotspot for a laptop or tablet. There is no second device to charge, carry or lose.

Our verified prices for a 10GB US plan, read on each seller's own site in August 2026, were $21.50 for Airalo over 7 days (13 August), $22.99 for Saily over 30 days (13 August) and $25 for Nomad over 30 days (17 August). Check whether the plan allows hotspot use; our Airalo hotspot page covers that brand's rules.

A MiFi or home router still wins when:

• several people need to share one connection all day;
• you are staying for months and want a local data-only SIM with a large allowance;
• you want a fixed connection in a holiday home or van, with an external aerial or mains power;
• your phone does not support eSIM (check our eSIM compatible phones list).

Which router with SIM card would we choose?

For a fixed place without broadband, a mains-powered 4G or 5G router with a data-only SIM sized to your usage. For travel, start with a travel eSIM and your phone's hotspot; buy a pocket MiFi only if a group needs to share or you plan to use local SIMs for long stays. Whichever you pick, buy the device unlocked, confirm the SIM size and the network bands, and remove the SIM PIN before you insert the card.