Still no word of this coming to thw UK though. NFC adoption is pretty poor here.
In fact I am still not sure this is quicker or easier than a chip and pin card.
I thought it is quite common. Marks & Spencer, House of Fraser, Robert Dyas, the canteen at my company, that's just a few where I used it recently.
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I'm pretty sure the limit is imposed by your bank (similar to the cash withdrawal limit). It's not hard wired into the nfc readers.
It's the bank that guarantees that the merchant will get their money in case of fraud, so it really _must_ be the bank that sets the limit. In the case of your debit or credit card, anyone stealing your card could use it with an NFC reader, so the amount must be quite low.
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Can someone please explain to me why previous generation iPhones and iPads are being cut out of using Apple Pay for online purchases? Clearly I can't do contactless payments with my 5s because no NFC, but what's the deal otherwise? Is this just an artificial limitation to get people to buy new phones?
The short answer is "because of the secure enclave processor that is only on the iPhone 6". The long answer: This thing will let you pay for expensive stuff with your iPhone. It must be _absolutely_ hacker proof. Even if you jailbreak your iPhone and install all the malware you can find anywhere, it must still be safe. That's why Apple built this secure processor. All the iPhone can do is send encrypted data from the NFC terminal to the secure processor, and receive encrypted data from the secure processor and send it to the bank. Your iPhone itself has no way to read or change any of the encrypted data, because it's all done inside the secure enclave processor and your iPhone has no way to look inside it.
On an iPhone 5, the whole thing could be made safe, but not safe enough, because the iPhone would have to do the encryption/decryption itself, and it's not possible to make that safe enough. (For example the encryption of your data on the iPhone isn't safe anymore after a jailbreak, but that's your own fault so don't blame Apple. But for Apple Pay on an iPhone 5, the bank's money wouldn't be safe after a jailbreak, so they will never allow this).