Smartphone market has a great potential for the VoIP technology. Every mobile app posted on iPhone's AppStore or Android's PlayStore gets a huge response from the community. There are several VoIP apps that have become popular among the mobile phone users including Skype, Viber, WhatsApp and Tango to name a few.
There is a boom of mobile apps these days. iPhone, Android, and Windows phone are the leading platform for which the applications are being built. Different technologies are being used to develop native mobile apps which is completely driven by the vendors. For example, iPhone, Android and Windows phone applications are being developed in Objective C, Java (for Android) and C# respectively.
Unified Communications (UC) and telemarketing products/services must conform to Telephone Consumer Protection Act (TCPA) compliance. Not all the current UC and telemarketing products/services adhere to the compliance. For a common man, it becomes very difficult to know whether telemarketing software he/she is using conforms to TCPA or not.
Now with the help of social media, customers can interact with the representatives of the company from not just company website but from wherever the customer like to connect from e.g. Facebook, Twitter. For example, tweeting at the company account for some sale inquiry would get you quick response than email.
Information and Communications Technologies for Development (ICT4D) is an initiative that aims at bridging the digital divide between technologically advanced countries/regions and under-developed countries/regions. It also aims to ensure economic development by providing equal access to communication devices such as cell phones, radio, television, computer and internet etc.
Using Android phones as a SIP client is not a big deal nowadays. It requires only to be connected either through 3G or WiFi as an extension to an Asterisk server. Your Asterisk server will act as a VoIP gateway for any outgoing calls. For inbound calls, you may require a DID, a VoIP phone line which usually costs very little.