Departure Lounge Daylight Robbery: The Truth About Airport SIM Kiosks and Your Locked iPhone
Those glossy kiosks flogging travel SIMs in Heathrow's departure lounges look like a lifesaver when you're rushing for a flight. But if your iPhone is still locked to your home network, that £40 SIM card is absolutely useless — and the person selling it to you probably won't mention that. Here's the full picture, including exactly how much time you need to sort a proper unlock before you fly.