first place, pick the right modem for the "deliverance" of the IED - Interface a GSM Modem and 8051 and retrieve decoded SMS Second use a PDU converter sms format

PDU converter is an online PDU string analyser.

Hexadecimal PDU Message		7/8/16 Bit PDU Message (readable)
		Show User data translation (7 bit only)

String sms message		Hexadecimal PDU Message
SMSC Receiver Alphabet Size 7816

http://www.smartposition.nl/resources/sms_pdu.html#PDU_CONVERTER