THey never answer and if they answer they just say we will solve your problem and they never do. Stay away from world sim card. They are cheeting. They just want you to buy the card and then no support. I have called and emailed and open case for 10 times.( i have 10mails) and their answer was " please test again and if there is a problem we are happy to assist you" thats it. No solution, no nothing. I cannot call UK numbers 0044. I have sent 10 emails, I lost money from my job because of the time tryting to connect with them and 2 weeks later, today the answer I received for my 10th email was
Dear customer, Please re-test and share latest couple of examples if failed again to investigate this issue further.

We will be delighted to assist you with any further queries that you may have.

What do you think? It is worth giving their money to them? Definately not. Stay away and try to find other sim cards for calling.
Travelsim, gocard, gosim, nowroming and others. STAY AWay people from WORLDSIM card