Clay SIM cards have the worst customer service--- I had bought their SIM card services for London and had specifically asked for a plan with more data limit than regular.. Turned out that after a 4 days I exhausted all the data on my plan and how I got to know was through the email they sent that now my data will be charged.. I paid an additional 3500 for 3GB data and after calling the customer services they said that it hasn't been activated instead I have free minutes to India.. I mean what the hell did I pay clay sims for.. Such pathetic services it's not even funny..