If you try to find duplicate number by manually it will take lot of time, I will show you easy way to find and delete same double contact number and name from your Android Phone, SIM & Gmail account, there is free and very handy app available in google play store.
1. Go to google play store, search and install “Contacts Optimizer”
2. Open the app, tap on “Select Account” select SIM, Phone or Gmail account. Tap on “Tap to find duplicate”, this will show duplicate contacts,
3. Tap on “Duplicate found : ** (tap to check)”, this will shows you detail of duplicate contact number and names if you want to keep some contact than uncheck the contact and tap on ”Next”, after this tap on “Delete duplicates”, be careful before you doing this, and do this on your own risk.
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