GPRS activation error

hi

here is sequence of commands issued to my telit module.sim works fine on mobile phone but here …

AT+CGDCONT=1,“IP”,“internet.globul.bg”,“0.0.0.0”,0,0

got: AT+CGDCONT=1,“IP”,“internet.globul.bg”,“0.0.0.0”,0,0

OK

AT#USERID=“globul”

got: AT#USERID=“globul”

OK

AT#PASSWD=“”

got: AT#PASSWD=“”

ERROR

AT#PKTSZ=300

got: AT#PKTSZ=300

OK

AT#DSTO=50

got: AT#DSTO=50

OK

AT#SKTTO=90

got: AT#SKTTO=90

OK

AT#SKTCT=600

got: AT#SKTCT=600

OK

AT#SKTSAV

got: AT#SKTSAV

OK

AT#GPRS=1

got: AT#GPRS=1

+CME ERROR: activation failed

any ideas ?