On 28th Feb, Kiosk at Mumbai international airport sold the 30 days UK plan as unlimited data, however, it was only 20 gb data plan.I had repeatedly insisted about my unlimited data requirement, The email with the number and plan is received well after landing in London. So, one doesn’t know what plan is purchased. It’s much cheaper and advisable to buy prepaid sim at Heathrow airport after landing than at Matrix kiosk in Mumbai. My sim is working but with limited data, so it’s a rip off. This plan could have been bought at a much lesser price in UK