The customer service number as provided by Clay Sim cards is totally not functional or forever busy. Or maybe it can only get through clay sim cards!!!!!! I was in Malaysia when i had to urgently call the customer service as my sim stopped working all of a sudden. And how could have i called considering the sim card wasn’t working!!! I tried dialling thru the paybooths also but all in vain. I was left without a number for the rest of the trip. Clay guys if you cant get the basics right in ur industry, mite as well stop being in the business. You suck big time !!