spice d88n — GSM Messages not being sent

Address:

Raipur, Chhattisgarh

I have Spice D88n dual SIM mobile phone. For CDMA, Tata Indicom is used and for GSM Idea is used. I am unable to send SMS from GSM number. No issue while sending SMS through CDMA number. There is one option in GSM message settings. SC address is the option. This is a 10 digit mobile number.For idea SIM, what is this 10 digit SC address?

Pl let me know.