Mobile VoIP
Consider these basic facts:
- Many people already have a smartphone
- The CPUs in today's smartphones are capable of running all the necessary software (including codecs) for VoIP
- Unlimited data plans are becoming more common for smartphone users
- Most smartphones also have wifi capability
The power of open source VoIP on a smartphone
Customisation: For the corporate and enterprise user, open source VoIP gives tremendous flexibility to customise the telephony experience to meet business needs. This simply isn't possible using the traditional VoIP desk phones running manufacturer-controlled firmware.
Disaster recovery: using technology like ENUM and Wifi, mobile VoIP can allow the entire enterprise to function in the event that the traditional phone system is crippled by a technical or environmental disaster
Where to begin
See the comparison of various mobile softphones for Android