If you activated the Find My iPhone option offered when you activated your phone, log onto iCloud.com from any computer, hand held device or browser (or use the Find My iPhone app on your iPad), go to the FMiP area and try to locate your phone. If it's still powered on and hasn't been restored/wiped, it should be locatable.
If I understand you correctly that it was lost last October, it's unliley you will find it.
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