I am trying to send SMS through Waspmote GPRS/GSM. But -- 

1. What is the "Setting PIN code"? When I use the Sim card in my mobile, there is no such code for calling through my handset. can I omit this portion from the code?

2. If I use the example for sending sms, most of the time it is showing "GPRS_Pro module cannot connect to the network..."

Till now, I could able to send only one SMS through Waspmote GPRS/GSM after a few trials.  Is it module problem or exiting network problem. I don't face any problem while I use the same sim card for calling/sms through handset. 

Any help will be apprecited.

I didn't find the right solution from the Internet.

References:

https://bit.ly/2Jrvs4Y

Thank you.