At the same time the company has changed its licensing arrangements, increasing the annual license costs for its software from $1,500 to $1,600, but allowing each license holder to install the software on more than one device.
This means a user of the cryptophone software in the office can also use the software on their smartphone at no extra charge.
As reported previously, Cellcrypt's software uses a unique session key for each voice call.
The software uses RC4 and AES encryption in multiple layers - the data packet is first encrypted with RC4 and the cipher text is then encrypted again with AES in Counter Mode (CTR).
Infosecurity notes that a 2048 bit seed pool is generated during the installation and is periodically updated. The initial seed, says Cellcrypt, is derived from the microphone input.
Richard Greco, the firm's CEO, said that the introduction of Cellcrypt Mobile for iPhone further strengthens the firm's position in the marketplace.
"The performance of Cellcrypt's application for iPhone is very impressive. In trials, customers are reporting international calling with near-perfect voice quality and latency better than landline calling", he said.
"Recently, an elite military communications unit made a call over a portable satellite terminal using Cellcrypt Mobile for iPhone and were so impressed that they immediately ordered a full-scale operational evaluation", he added.
Cellcrypt's app is available for free download on the iTunes appstore.