I was looking for a 3 month plan for UK and my colleague asked me to use a clay SIM card. He had some good things to say about it, so I bought one on his recommendation. It was a teally bad experience for me. After landing my sim didn't work for 8 hours despite calling and hearing that it will happen in an hour. My first month bill was around 15k! Insanely high and my usage was peanuts. After checking the bill closely I saw that the duration was tampered with. It was only after the first month experience that I got the plan canceled and bought a sim locally which was much faster and cheaper.