hutch prepaid sim card

hii i’m sameer presently i’m in saudi arabia, i was in india for last 2 months n was using hutch prepaid sim card. i want to activate international roaming in my sim card, its validity is of 2 years so plzz help me to do so. n even i had activated yahoo messenger in my mobile n i request u to help me to signout of my mobile even though the number is not in use. awaiting for ur kind response.