wvdial not working giving No Career error for Tata Docomo 3g

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http://stackoverflow.com – I am trying to connect to internet with my tata photon 3g but it's not working and giving me the following error: [root@localhost /]# wvdial --> WvDial: Internet dialer version 1.61 --> Initializing modem. --> Sending: ATZ ATZ OK --> Sending: AT+CGDCONT=1,"IP","TATA.DOCOMO.INTERNET" AT+CGDCONT=1,"IP","TATA.DOCOMO.INTERNET" OK --> Modem initialized. --> Sending: ATDT#777 --> Waiting for carrier. ATDT#777 NO CARRIER My wvdial.conf is as follows: [Dialer Defaults] Init1 = ATZ Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0 Modem Type = USB Modem Phone = #777 ISDN = 0 Pa (HowTos)