I am working on a project that involves using a arduino to communicate via a SIM900 using a aeris SIM card. Thus far I have been unable to establish a connection for the registration or data sessions after powering the device with the SIM card properly inserted. I was wondering if there is a particular line of code that I need to establish this connection and if someone can point me in the right direction or provide me with some resources to help me establish the connection. I have never attempted any GSM connections so I apologize if this is a simple problem but as of the time being I am not sure what I am supposed to do. Thank you.