DUBLIN--(BUSINESS WIRE)--Research and Markets (http://www.researchandmarkets.com/research/52wld6/global_voice_and) has announced the addition of the "Global Voice and Data 3G/4G Smartphone Tariff Tracker and Analysis " newsletter to their offering. Pricing is used as one of the key differentiators by mobile operators across the industry. To keep up-to-date with the increased complexity of packages offered is a challenge. The author has researched and collated prices for post and prepaid price p