Airtel, the leading Indian network provider has imposed a thrash on its internet users by announcing that its subscribers have to pay an extra amount of money if you are making calls on online service providers like Skype, Viber etc. Read "Airtel, India’s best network provider is facing troubles with its 3G service"
This is actually the first time in India when any mobile operator has charged an extra amount for 'Voice Calls Over Internet' (VoIP). So basically a service provider which is already facing serious issues of internet speed delivery will be charging more for the free service provided via online for VoIP.
The charges are still something which are further more hurting. VoIP would be at standard data rates of 4p/10 KB (3G service) and 10p/10 KB (2G service).
Airtel said in a statement.
”We have made some revisions in the composition of our data packs, and will offer VoIP (Voice over internet protocol) connectivity through an independent pack that will be launched shortly. Our customers can continue enjoying voice calls over data connectivity by opting for this VoIP pack, or simply use VoIP services on pay-as-you-go basis,”
Mobile network operators have been spending a large sum of money in promoting and branding rather than technology enhancement. Anyways in era of technical advancement, we should be expecting revolution in data field not evolution in charges 
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