Never ever use Uniconnect for international calling purposes! I had taken one on a recent business trip to London prepaid card, which I thought would be economical. Turns out the plan was super expensive and the call rates were not at all economical! For the first 3 days my sim wasn’t working and I was using the office  landline to work through the day.. And for whatever 6-7 days that the card worked, I have recharged my phone atleast 5 times and for almost 3000/- rs everytime ! Really pathetic and horrible experience!