We have introduced the ne version of GSM library! http://www.hwkitchen.com/news/gsm-playground-software-library/
The main changes are that it is possible to make an authorization of caller number (call and SMS), deactivate DTMF receiver outputs so that these signals can be used for another purpose (Ethernet Shield) and to have a direct printing of Debug information on the serial line...
All sketches were updated about the new library features.
The new library function has higher requirements for memory so it needs ATmega328 with 2kB SRAM.
All differences compare to previous version (V1.00) are described at the end of this document. http://files.hwkitchen.com/200000173-93e3594dc7/GSM%20Playground%20Software%20Library.pdf
It is also possible to use the GSM library without GSM Playground hardware with another GSM Module from Telit - eg. GM862.