With the nature of my work, I travel almost every alternate month to Singapore and these alternate months cost me a bomb on my phone bills. After trying several options, like a prepaid local sim from Singapore itself, buying that everytime was a pain. I was recommended to use a matrix international sim card by a close friend. So I did! Stating my experience with these guys: Response time to delivery time is very good. On an average my bill has never been less than 20K but I was pretty happy to see that with Matrix, the billed amount ranged anything between 10K-12K. Network and data services, as good as the local providers. I have used Matrix twice now, and Both the times I was pleasantly surprised. Definitely sticking to this one.