Thanks.
I just attempted to insert the SIM in different positions because you asked 
, it gets in only one way.
I am supplying 4.1V to the breakout pin 3 (Vcc) on the side. Is there any test point where I can check the voltage of the output of the internal regulator?
You are right about 3.3V not being sufficient when using with the SIM, I did try that initially and it didn’t work.
@seraphim
I am using the Eclipse IDE (with native SDK) for making HTTP calls (also DNS and NTP calls). For some reason Seeed Studio hasn’t ported the GPRS libraries to Arduino (I am assuming you are using the Arduino IDE). If you have basic understanding of C, it isn’t too difficult to work with Eclipse because the SDK is well documented and has lots of examples. But, of course, you might lose some benefits of Arduino IDE like the already ported libraries 