4G, 5G or Wi-Fi Only? Connectivity for Site Work

If you work outdoors, move between sites or ever need to send something before you leave a job, buy a device with 4G or 5G built in and give it its own SIM. Hotspotting from your phone works, but it is a compromise you will feel most days. Wi-Fi only makes sense in fewer cases: a tablet that lives in a site office, a workshop or a vehicle with its own router, or one that plugs into a network cable.

The Three Ways to Get a Site Tablet Online

Wi-Fi only. The tablet joins a wireless network like a laptop does. It is online in the office, at home or in a site cabin with a router. Everywhere else, it is offline.

Hotspot from your phone. Your phone shares its mobile data as a small Wi-Fi network and the tablet joins it. No SIM in the tablet, no second plan. The tablet is online whenever the phone is nearby, awake and has signal.

Built-in 4G or 5G. The tablet has its own mobile modem and SIM slot. Put a SIM in and it is online wherever there is signal, on its own, with nothing else to carry or keep charged.

Every device in our range has Wi-Fi. Five of the six have 4G or 5G built in. The sixth, the Tuga W10, has Wi-Fi and Ethernet as standard and 4G LTE as an option, covered below.

Hotspotting: When It Is Fine and When It Is Not

Hotspotting is a sensible choice for one person with one tablet that only needs to be online now and again. If you fill in forms offline and sync back at the van, you may never notice the limits.

The limits show up when the tablet becomes the main tool rather than the spare:

• Two batteries, not one. A hotspot keeps the phone's modem and Wi-Fi radio working flat out. A phone that dies at three o'clock takes the tablet offline with it.
• The phone has to be with the tablet. Leave the phone in the cab while the tablet goes up the scaffold and the connection goes with it. Anyone else using the tablet needs your phone too.
• Hotspots drop. Many phones switch the hotspot off after a few idle minutes or when the phone locks. You end up reconnecting several times a day, usually while a customer is waiting to sign.
• Data allowance and tethering rules. Everything the tablet uploads comes out of the phone's plan, and some plans cap tethering. Check yours before you rely on it.

A reasonable rule: if you would be annoyed to find the tablet offline more than once a week, give it its own connection.

Built-in Data: What You Actually Need

A tablet with 4G or 5G needs a SIM and a plan to go with it. Data-only SIMs are sold on monthly contracts and pay-as-you-go. Check the SIM size before you order one. The WH6 lists a nano-SIM slot; for the other models, ask through the contact form. Pick on price, allowance and whichever provider gives you signal at the sites you work on most.

How much data? Start from what you do now. Your phone's settings show data use per app, so look at the apps you plan to move to the tablet. Job sheets, forms and signatures are tiny. Photos are much larger than job sheets and add up over a month. Video, drawing packages and cloud backups are where allowances disappear. If in doubt, start with a plan you can change after the first month.

4G or 5G: Does It Matter?

For most trade work, 4G is enough. A job sheet, a signature and a dozen photos go over 4G without trouble. 5G is faster, which helps most when you send a lot at once: a day of photos sent in one go, video walkthroughs, large drawing files, or several people on one job syncing at once.

5G is not available everywhere 4G is, so check the sites you work at and do not expect it to fix a weak-signal problem.

In our range, 5G is on one device: the Tuga A6 at £299, a 6.78 inch Android handheld with a 64MP night vision camera and a 50MP main camera. It is the one to look at if photos and video are the bulk of what you send, because the camera and the connection are in the same pocket. The 10600mAh battery helps too, since a modem working hard on uploads drains a device quickly.

Dual SIM and Rural Coverage

Signal is the problem nobody can design around. On a farm, a quarry or a new build at the edge of a village, one provider may be fine and another useless, and it is rarely the same one from site to site.

Dual SIM is one way round it. The device takes SIMs from two providers, so you are not tied to one network on sites where coverage differs. For anyone working across a wide rural area, or on jobs where being offline costs real money, two cheap SIMs on different networks can be better value than one expensive one.

It is not a magic fix. Two SIMs with no signal from anyone is still no signal. And if you work in one area and know which provider is reliable there, a single SIM is simpler and cheaper. Dual SIM earns its place when your sites are spread out or coverage is unpredictable.

In our range, dual SIM 4G is on the Tuga A10 at £449, the 10.1 inch Full HD Android tablet built for drawings, plans and spreadsheets. Its dual SIM 4G is aimed at patchy rural coverage, so it suits anyone whose sites are spread across the countryside.

Whatever you buy, two habits help in weak-signal areas:

• Choose apps that work offline and queue uploads. A good job management or inspection app lets you finish the work with no signal and sends everything when the connection returns. Check that your apps do this, and that they run on the device you are considering, before you commit.
• Check coverage before you buy a SIM, not after. Providers publish postcode coverage checkers. Run your regular sites through two or three of them. It takes little time and costs nothing.

When Wi-Fi Only Is the Right Call

There is a real case for a tablet without a SIM, and it saves money every month. You do not need a Wi-Fi only model to avoid the monthly cost; you just do not buy a SIM.

• It never leaves a building with Wi-Fi. A workshop, a plant room, a warehouse, a site office with a router. If the tablet lives there, a SIM is a monthly cost for nothing.
• It plugs in. Engineers who connect to panels, controllers and network gear often want a cable, not a wireless link. The Tuga W10 has an RJ45 Ethernet port alongside HDMI, USB-C and USB-A, so it can sit on a lead to equipment that has never seen Wi-Fi.
• The vehicle has its own router. Some vans and plant are fitted with a 4G router that gives everything on board Wi-Fi. If yours is, a Wi-Fi only tablet in a vehicle mount is already connected.
• You sync at the end of the day. Survey and inspection work collected offline and uploaded from the office needs no connection on site.

The W10 is a 10.1 inch Windows 11 Pro tablet at £649 with dual-band Wi-Fi 5 and 100Mbps Ethernet as standard, and 4G LTE listed as an option. If you want the W10 with 4G LTE, ask through the contact form before ordering to confirm what is available and the price.

Getting Photos Off Site

Photos are usually the biggest files a tradesperson sends, and they are often what gets stuck in an outbox. Three habits help:

• Let the app do the uploading. Attach photos inside the job management app rather than emailing them. Many job apps queue photos and retry when the signal returns, so check that yours does. Emailing a batch of large photos on a weak signal is the more likely way to end up with a stuck outbox.
• Upload before you drive off. Signal is usually better in the open or in the cab than inside a steel-framed building or a basement. A few minutes at the van with the tablet on the dash will usually clear the queue.
• Keep it charged. Uploading on a weak signal keeps the modem working hard, and cold drains the battery faster still, as our winter battery guide explains. The 12V DC Car Charger at £26 fits every device in the range.

Connectivity Across the Tuga Range

• Tuga A6, £299. 5G plus Wi-Fi 5.
• Tuga A8, £379. 4G LTE plus Wi-Fi 5.
• Tuga A10, £449. 4G dual SIM plus dual-band Wi-Fi 5.
• Tuga WH6, £699. 4G LTE plus dual-band Wi-Fi 5, with a nano-SIM slot.
• Tuga W8, £629. 4G LTE plus Wi-Fi 5.
• Tuga W10, £649. Dual-band Wi-Fi 5 and 100Mbps Ethernet as standard, 4G LTE optional.

No VAT to add, and delivery is free to UK addresses in 7 to 10 working days. Every device comes with a 12 month warranty.

A Quick Way to Decide

1. Does the tablet stay in a building with Wi-Fi, or plug into a cable? If so, you do not need a data plan. Every device in the range has Wi-Fi, so a 4G model simply stays on Wi-Fi if you never fit a SIM. Choose the W10 only if you need its Ethernet port.
2. Is it the spare or the main tool? A spare used now and again can hotspot from your phone. A main tool should have its own SIM.
3. Are your sites spread out or rural? Yes: dual SIM, so the A10. No: a single 4G SIM on the provider that works where you are. Dual SIM is listed only on the A10; none of the Windows devices lists it.
4. Is most of what you send photos or video? Yes: 5G can cut upload time, so look at the A6. No: 4G is enough.
5. Do you need Windows? If a program you rely on only runs on a PC, the WH6, W8 and W10 all run Windows 11. Our Android or Windows guide helps you decide.

If you are weighing the whole spec sheet rather than just the modem, our guide to the best tablets for field engineers covers GPS, cameras and battery alongside 4G. Kitting out a team? Bulk pricing applies to the devices.