SMS sending and reception from SIM/UICC/USIM applet
I'm looking for examples of how to send and receive SMSes from my SIM/UICC/USIM application.
I understand general idea behind SIM Toolkit API, that I can send SMS using PRO_CMD_SEND_SHORT_MESSAGE proactive command and subscribe to received SMSes using EVENT_FORMATTED_SMS_PP_ENV / EVENT_UNFORMATTED_SMS_PP_ENV. However I'm confused by lack of descriptions in ETSI/3GPP/GSM specifications. What is the difference between formatted and unformatted SMS, which TLVs are used for these commands/events, what is SMS TDPU TLV.
Please tell where should I be looking at to find this information.