I had assumed tap to pay on iPhone in the UK was a toy for small sums. Anything over the £100 contactless limit, I thought, would need a proper card reader with a keypad, so a phone could only ever be the backup machine. I was wrong about that. Apple's UK support page, which I read on 16 September 2026, spends a surprising amount of its length on how a customer types a PIN into the merchant's phone.
So the real question is not whether a phone can do the job. In most situations it can. The question is what you actually save by using one, and the answer turned out smaller than the marketing and larger than my prejudice.
What it is, in dated facts
Apple switched Tap to Pay on iPhone on for British businesses on 13 July 2023. The launch release said it takes Apple Pay, contactless credit and debit cards and other digital wallets on an iPhone XS or later running a current iOS, through a payment provider's app, with no extra hardware or terminal at all. American Express, Mastercard and Visa contactless cards were named. Revolut and Tyl by NatWest were first to offer it, with Adyen, Dojo, myPOS, Stripe, SumUp, Viva Wallet, Worldline and Zettle by PayPal listed as coming soon.
Three years on, the list Apple keeps for developers under the heading United Kingdom has seventeen names on it when I read it on 16 September 2026: Adyen, Dojo, Global Payments, Mollie, myPOS, PayPal, Rapyd, Revolut, Square, Stripe, SumUp, Surfboard Payments, Tapeeno, Teya, Trust Payments, Tyl by NatWest and Viva.com. Worldline, named in 2023 as coming soon, does not appear on that list. I do not know why, and one missing name out of 17 is not enough to read anything into.
One line from Apple's support page matters more than the rest put together. Every payment taken this way is processed by your payment service provider and deposited to the bank account you set up with that provider. Apple supplies the tap, and the provider supplies the price, the payout calendar, the contract, the list of accepted cards, the offline setting and every other decision that later turns up on your statement, which is why that single sentence on a support page carries more of the economics of Tap to Pay than the whole launch release.
Who was promised in 2023, and who is actually on the list
I went looking for the difference between the 2023 announcement and today's list, because nobody I read had put the two side by side.
In July 2023 Apple named ten providers: Revolut and Tyl by NatWest live on the day, and eight coming soon. On 16 September 2026 the United Kingdom list holds seventeen. Nine of those are the 2023 names, give or take a rebrand: Revolut, Tyl by NatWest, Adyen, Dojo, myPOS, Stripe and SumUp, with Viva Wallet now listed as Viva.com and Zettle by PayPal now simply as PayPal. Eight are new since the launch: Global Payments, Mollie, Rapyd, Square, Surfboard Payments, Tapeeno, Teya and Trust Payments.
And one name has gone. Worldline was on the coming-soon list in 2023 and is not on the list in 2026.
The count matters for a shop owner in one practical way. Square, which publishes one of the two Tap to Pay prices I could read, was not in the 2023 announcement at all. If you read a guide written in the first year, it will send you to a shorter list than the one that exists.
The same 2023 release said Apple Pay was already accepted at more than 99 percent of UK retailers. That number explains the pitch. The terminals were already there. What Apple was selling was the chance not to buy one.
The PIN question I had wrong
On a phone the customer types their PIN on the merchant's screen. SumUp's page puts it plainly: for larger transactions the customer is asked to enter their PIN, usually for any amount over £100.
Apple has thought about the awkward parts. There is an accessibility mode for PIN entry, in which the phone reads instructions aloud and the customer can draw each digit on the screen or tap once per digit, then swipe right with two fingers to submit. The PIN screen times out after five minutes. You can switch on a screen lock so the phone locks while the customer enters the PIN and you unlock it afterwards. Square's page adds that Apple does not store card numbers or PIN information on the iPhone or on Apple's servers.
I find the accessibility detail genuinely reassuring, and I am slightly annoyed at myself for assuming none of it existed. Handing your personal phone to a stranger to type a PIN is a different act from turning a reader round on the counter, and some customers will feel that before they think about security at all.
What it costs
Here is the finding I keep thinking about, and it fits in two numbers. The phone changes the hardware line. It does not change the rate.
SumUp charges 1.69% per transaction on its Tap to Pay page with no monthly fee, or 0.99% on a plan it describes as from £16 a month. That "from £16" squares with its card reader page, which prices the same plan at £19 monthly or £189 a year: £189 divided by twelve is £15.75. Square prices Tap to Pay from 1.75% per tap. Those are the same rates each of them charges for a payment on their own card readers, which I compared on the terminal page.
Put numbers on a small month, because the percentages hide how little is at stake at this size. £1,000 of card sales at 1.69% costs £16.90. On the 0.99% plan it costs £9.90 plus the plan. The saving of 0.7 points only covers a £16 plan at about £2,286 of monthly card sales, before you ask whether that figure includes VAT. That break-even belongs to the plan. The phone has nothing to do with it. A reader on the same plan lands on exactly the same number, to the penny, month after month, because the rate is attached to your account with the provider and not to whatever piece of glass or plastic the customer happens to hold their card against.
What the phone saves is the reader itself. SumUp's cheapest reader was £15 on the day I checked and Square's was £19 plus VAT. So Tap to Pay spares a new business something in the region of fifteen to fifty pounds, once. Set that against £16.90 a month in fees on a thousand pounds of sales: the whole reader costs roughly one to three months of the fees you pay with or without it. Against a year of fees on even a modest shop that is a rounding error, and I would say so to anyone about to switch provider for the sake of a phone.
What to do with this
Choose the provider on rate and calendar, not on the phone
Every provider on the list gives you the same tap. What differs is the rate per sale, the monthly plan, the payout calendar and the contract. Compare those exactly as you would for a reader. Tap to Pay is a feature of the provider.
Ask before relying on it
Start with the cards. Which card brands does your Tap to Pay setup accept? Does it support Store and Forward, and with what limit? Is PIN entry on the phone switched on for your account? Get the answers in writing.
Keep a reader if you have a counter and a queue
A phone makes a brilliant second machine. As the only machine at a busy counter it is mediocre. If the reader costs £15 to £19 plus VAT, the insurance is cheap.
Keep your personal phone out of it
If you use Tap to Pay at a till, use a phone that is only for taking payments, with the screen lock on during PIN entry. A spare iPhone XS or later costs more than the £15 reader you were trying to avoid, which rather proves the point of this whole note.
Where a phone falls short, and where it wins
An aside about taxi drivers, which has nothing to do with shops. Apple's own business page, describing SumUp, names hairstylists and taxi drivers, and a taxi is exactly the place where a phone beats every other option, because the driver already has it in hand and the passenger is already holding their card. Anyway, back to the counter.
At a fixed counter the argument turns round, and the iPhone XS minimum Square lists on its page, a model from 2018, tells you the hardware bar is low but not zero. A reader sits on the counter all day, the phone has a hundred other jobs, and every notification during a busy lunch arrives on the device the customer is about to tap. I suspect most shops that try a phone at the till end up keeping it as the second machine rather than the first. That is a guess from how counters work, not a number I can show you.
There are also cards a phone will not take. Apple's support page says plainly that your payment provider decides which cards it accepts in its Tap to Pay configuration, and that an international customer may have a card that is not widely accepted outside their region. A reader can have exactly the same restriction. The difference is who you ask about it. The answer sits with your provider, not with Apple, and it is exactly the kind of detail worth getting in writing before a tourist season rather than discovering it at the counter with a card from a bank the configuration was not set up to recognise.
The feature I did not expect is offline payments. On an iPhone with iOS 18.4 or later, Tap to Pay supports taking transactions without a connection in what Apple calls Store and Forward mode, but only if your provider supports it. For a market stall in a field with no signal, that single setting decides whether the phone is usable at all.
What I could not establish
I could not find published Tap to Pay prices for Dojo, Tyl by NatWest, Revolut or Teya, because I did not read their pages on 16 September 2026 for this note. The two rates above are the two I read, and I would rather print two confirmed prices than seventeen guesses.
I could not establish which of the 17 providers support Store and Forward on iOS 18.4 in the UK today. I have not found a published figure for how much battery a phone uses per hundred taps either, and that number would settle the counter question better than any argument here. Apple says to ask your provider, and that is exactly the question to put to them.
Worldline is the loose end. Apple named it as coming soon in July 2023, and three years later, on a list that has grown from ten names to seventeen, it is missing. I still cannot tell you why.