It was my bad luck that I bought a clay sim card for my very first travel to Singapore. I was there for a week and of those 7 days, my sim didn’t work beyond three days. A sudden shut down with no respite from clay’s customer care. They turned out be more useless than the services itself. I think all they want is for us to buy and pay for services that don’t seem to work after a while. Never using Clay Sims again.