HT201412 unable to support another sim card

hi i am using i phone4 having serial no-KL******DZZ , IMEI NO-*********** This mobile hasbeen some problem. it means now i am using zain bahrain national sim card now i cant able to change another sim card . when ever i put another company sim it will show no service i do not understand , what wrong with this i phone plz let guide me
regards
satheesh
<Personal Information Edited by Host>

Your phone is locked to the original carrier.  You will have to speak to them to see if they offer unlocking.

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