Three Data Passport Explained: Unlimited Data Abroad for £6 a Day
Three Data Passport Explained: Unlimited Data Abroad for £6 a Day
Last updated: April 2026
You are running a wedding photography business. You have just shot a destination wedding in Tuscany. The bride wants the highlight gallery uploaded by tomorrow morning so her family can see it before they fly home. You are sitting in your hotel room in Florence with 11 GB of edited photos and your monthly Three roaming data allowance is 12 GB, of which you have already used 8 GB navigating, sending texts, and posting to Instagram during the trip.
You have a problem.
This is the kind of situation Three Data Passport solves. It is a roaming add-on that gives you unlimited mobile data in 89 destinations for £6 per day. You activate it for the days you want, you use as much data as you like on those days, and the meter stops when you leave or when the day ends.
It is a niche product. Most business travellers do not need it. The ones who do, however, need it badly enough that it pays for itself on a single trip. Here is the proper version: who actually benefits, when it makes sense, and when you are wasting money.
What Data Passport Actually Is
Data Passport is a separate add-on from Three's standard Go Roam allowances and Inclusive Roaming plans. The standard Three Business roaming data cap is 12 GB per line per month, regardless of whether you are on Inclusive Roaming or paying daily charges. Once you hit that cap, you start paying out-of-bundle data rates, which add up fast.
Data Passport is the way out. For £6 (including VAT) per day, you get unlimited mobile data in 89 supported destinations. The £6 covers 24 hours of activation. After that, the day expires and you can either let it lapse or activate another one.
It does not auto-renew unless you explicitly set it to. It does not cover voice calls or texts (those are still on your underlying tariff). It does not cover destinations that are not on the 89-country list. And it does not stack with anything in any clever way: you get unlimited data on activated days, full stop.
Think of it as an emergency-relief product for heavy data days, not a default setting.
Who Actually Needs It
Most business travellers do not. The standard 12 GB monthly cap on Inclusive Roaming handles email, maps, video calls, browsing, and a moderate amount of file syncing without breaking. If your only roaming use case is "normal phone things," Data Passport is overkill and you should not buy it.
It pays off in five specific situations.
1. Heavy File Uploads
Photographers, videographers, drone operators, surveyors, anyone uploading large media files from a remote shoot. A single 4K project can blow through 12 GB in one afternoon. A wedding gallery, an event highlight reel, a topographic survey dataset. These eat through the standard cap quickly.
If you are in a creative business that involves shooting on location and delivering to clients on a tight turnaround, Data Passport is one of the few products that lets you do your job from anywhere without worrying about the bill.
2. Live Streaming or Persistent Video
Anyone streaming high-quality video for a client or running a live event broadcast. Webinar production, live sports correspondents, broadcast journalists, tour operators streaming destination content. The data cost gets out of hand quickly without a flat-rate option.
3. Backup of an Entire Workflow
Cloud backup, Dropbox sync, OneDrive, Google Drive auto-uploads. If you have been somewhere for two weeks and your phone has been quietly syncing photos and documents that whole time, the standard cap will not hold. Data Passport stops you worrying about it.
This is more common than people realise. Modern phones do an enormous amount of background syncing for photos alone. A two-week trip with 500 photos at 5 MB each is 2.5 GB just from that one source.
4. Tethering a Laptop
If you are tethering your phone to your laptop for office work while abroad, you are using mobile data the way fixed broadband uses fibre. A laptop will easily push through 5-10 GB in a single working day. Three Data Passport caps the cost regardless of how heavy you go.
5. Sales or Field Work With Heavy CRM Use
If your team uses cloud-based tools that auto-sync large datasets (CRM systems, ERP systems, cloud document management), the data adds up. The 12 GB cap is enough for a moderately heavy office worker. It is not enough for a sales rep doing a week of intense pipeline work from a foreign hotel.
Where It Works (and Where It Does Not)
89 destinations as of early 2026. The list covers all the obvious ones: most of Europe, the US, Canada, Australia, Singapore, Hong Kong, the UAE, Brazil, and so on. Some less obvious ones are included too. A few notable absences exist in parts of central Africa and central Asia. Three publishes the current list and updates it from time to time.
If you are going somewhere unusual, check the destination list before you assume Data Passport will work there. The countries that are NOT on the list will fall back to the standard Three roaming rates if they are on the Go Roam list at all, or to no service at all if they are not.
The list is broadly the same as the combined Go Roam destinations, with a few gaps. The main thing to remember is that "Data Passport works in 89 places" is not the same as "Data Passport works everywhere Three covers." There is a difference.
The Maths: When £6 a Day Actually Saves Money
If you stay within the 12 GB monthly cap on the standard Inclusive Roaming, you are paying nothing extra for data. Data Passport saves you nothing. Do not buy it.
If you go over the cap, you start paying out-of-bundle rates. Those are typically somewhere around £6-10 per gigabyte depending on tariff. Use even half a gig over the cap and you are at £3+. Use 5 GB over the cap and you are at £30+ in unplanned charges.
Data Passport at £6 per day caps the cost regardless of usage. Use 50 GB on a Data Passport day, you pay £6. Use 5 MB on a Data Passport day, you also pay £6. The point is the cap on cost, not the cost itself.
The rule is therefore: activate Data Passport on days you know you will do something heavy. Do not leave it on permanently. If you are abroad for two weeks but only doing the heavy uploads on three of those days, only buy Data Passport for those three days.
For someone doing a single heavy day, Data Passport saves you potentially £20-50 in out-of-bundle charges for £6.
For someone doing a week of moderate heavy use, it might save you £30-70 over the week for £42 of pass cost.
For someone doing 12 GB of normal use across a fortnight and never going above the cap, it saves you nothing and costs you the £6 per activated day.
Pick wisely.
Data Passport Stacks With Other Roaming Products
Here is the bit that confuses people. Data Passport is a separate product from Inclusive Roaming and from daily Go Roam charges. They stack.
You can be on Inclusive Roaming Go Roam Around the World (which gives you no daily charge in 71 destinations and a 12 GB monthly data cap) AND activate Data Passport on a heavy day (which gives you unlimited data on that day in any of the 89 supported destinations). They do not conflict. Both products charge separately and the Data Passport activation just unlocks the data cap on that day.
The same applies to daily-charge roaming. You could be on a standard tariff with no Inclusive add-on, paying £2 a day for Europe roaming, AND activating Data Passport on a heavy day for an extra £6. You would pay £8 total that day, you would get unlimited data, and your normal voice and text allowances would still apply.
This stacking is useful because it lets you mix and match. The Inclusive plan handles your routine usage. Data Passport handles the days where you suddenly need more.
How It Actually Works in Practice
You activate Data Passport from the My3 app or via Three customer service. The activation starts a 24-hour clock. During that 24 hours, your data usage is unlimited on the supported destinations. The clock stops when you leave a supported destination, but as long as you are in one, the day continues.
There is no automatic activation. You have to manually trigger it for the days you want. This is intentional, because most people do not need it on most days, and Three does not want to charge you £6 every day you happen to be abroad.
If you forget to activate it before a heavy upload day, that is on you. You will pay out-of-bundle rates for the data you used. There is no retroactive activation.
For CTN customers, we set up the right defaults on your account so the right people in your business can activate it without going through Three support every time. That removes one of the most common pain points: needing to use it urgently and not knowing how to turn it on.
The Mistake to Avoid
The most common mistake we see is businesses adding Data Passport to every line by default and never using it. Do not do that. The product is meant for occasional activation by the people who actually need it, not as a blanket safety net for the whole fleet.
Add it to the SIMs that have a real reason to need it. Activate it on the days that have a real reason to need it. The bill stays sensible.
The opposite mistake is also common: not having Data Passport set up at all on a SIM that legitimately needs it, then getting hit with out-of-bundle charges after a heavy day abroad. The fix is to talk to whoever manages your account before someone goes on a trip where heavy data use is likely.
If you want help working out which SIMs need Data Passport and which do not, we can do that as part of any quote at Compare The Networks. Send us the use cases and we will configure the account properly. Free quote here.
Frequently Asked Questions
Q: Is Data Passport really unlimited?
Yes, on the days it is active. Three does not throttle it.
Q: Does it work in countries Three does not roam in?
No. It is a separate destination list of 89 countries. Check the list before you travel.
Q: Can I activate it mid-trip?
Yes. You do not need to set it up before you leave.
Q: Does it cover voice calls and texts too?
No. It is a data-only add-on. Voice and texts are still on your underlying plan.
Q: What happens if I run my phone for a normal day with Data Passport on?
You pay £6 for that day even if you only use 50 MB. It is a daily flat fee, not metered. Only activate it on days when you actually need it.
Q: Can I activate Data Passport on multiple SIMs in the same business account?
Yes. Each SIM is activated independently. You can put a sales rep on Data Passport for a week while leaving your office staff on standard.
Q: How long does Data Passport take to activate?
It is usually live within a few minutes of activation, sometimes immediately.
Q: Does Data Passport work on Three Business Broadband?
That product has its own data terms separate from mobile roaming. Talk to us if you have a specific use case.
Q: Is there a cheaper alternative if I just need a bit more data?
If you only need a small amount over the cap, the out-of-bundle data charges might be cheaper than activating Data Passport. The tipping point is around 1 GB over the cap. Below that, just pay the out-of-bundle. Above it, activate Data Passport.
Q: Do I have to commit to Data Passport for the whole contract?
No. It is an on-demand add-on. You activate it when you need it and ignore it otherwise.