Sony Ericsson TM506 phone GPRS using AT NO CARRIER error

[kousikmandal]

gprs at command no carrier error

Hi
I am using Sony Ericsson TM506 phone for GPRS using AT command I had

at+cgdcont?
+CGDCONT: 1,"IP","epc.tmobile.com","0.0.0.0",0,0
+CGDCONT: 2,"IP","wap.voicestream.com","0.0.0.0",0,0
+CGDCONT: 3,"IP","gprseast.cellone.in","0.0.0.0",0,0

OK

but if I execute ATD*99***3# It gives following
~ }#À!}!}!} }9}#}%Â#}%}(}"}'}"}"}&} } } } }%}&ôÂ}0!ú~
CONNECT
~ }#À!}!}"} }9}#}%Â#}%}(}"}'}"}"}&} } } } }%}&ôÂ}0í}7~~ }#À!}!}#} }9}#}%Â#}%}(}
"}'}"}"}&} } } } }%}&ôÂ}0©L~~ }#À!}!}$} }9}#}%Â#}%}(}"}'}"}"}&} } } } }%}&ôÂ}0
dÄ~~ }#À!}!}%} }9}#}%Â#}%}(}"}'}"}"}&} } } } }%}&ôÂ}0 Ÿ~~ }#À!}!}&} }9}#}%Â#}%}
(}"}'}"}"}&} } } } }%}&ôÂ}0ìr~~ }#À!}!}'} }9}#}%Â#}%}(}"}'}"}"}&} } } } }%}&ôÂ
}0¨)~~ }#À!}!}(} }9}#}%Â#}%}(}"}'}"}"}&} } } } }%}&ôÂ}0gk~~ }#À!}!})} }9}#}%Â#}
%}(}"}'}"}"}&} } } } }%}&ôÂ}0#0~~ }#À!}!}*} }9}#}%Â#}%}(}"}'}"}"}&} } } } }%}&
ôÂ}0ïÝ~
NO CARRIER

I am not able to do GPRS.

Please help me.
Thanks in advance