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https://360trendies.com/2017/08/09/how-to-double-your-mtn-data-turn-1gb-to-2gb-2gb-to-4gb-5gb-to-10gb-eligible-to-all-mtn-subscribers/
How To Double Your MTN Data: Turn 1GB to 2GB, 2GB to 4GB, 5GB to 10GB (Eligible to all MTN Subscribers)