CMVoIP is a mobile VoIP service for iPhone, iPad and iPod Touch with Challenger Mobile technology. The CMVoIP service enables users to make calls using any available IP network and access very competitive rates.
CM Showcase client features:
• Making mVoIP calls to any fixed or mobile number in the world.
• Making and receiving mVoIP-to-mVoIP calls
• Connect through WiFi and 3G
• Phonebook integration
• Call logs