At around 2,000 ($2800) each, the secure smartphones that SecuSmart showed at Cebit last year were out of reach of many businesses -- although three governments have since bought them to secure mobile phone calls between senior officials, according to CEO Hans-Christoph Quelle. Now the company has developed a less expensive and more flexible system intended for the enterprise and has extended the reach of its mobile system to secure VOIP calls on desktop phones.