FusionOne | 276 followers on LinkedIn. FusionOne is the established leader in mobile content portability, helping mobile subscribers transfer their content between mobile devices and sharing their content with popular internet applications—anytime, anywhere. FusionOne pioneered mobile phone content transfer and its products, including Handset Transfer Solution and Network Address Book, currently support millions of subscribers on many major carriers worldwide. Founded in 1998, FusionOne is headquartered in San Jose, California with additional offices in Tallinn, Estonia.