In last few days the most trending topic was the offer given by the reliance telecom which is giving unlimited 4g data to its user and high speed data for 4gb limit per day and later on 128kbps. The voice quality is good the only problem I have noticed is on few networks it says the other person whom you are calking is busy with someone else but its not totally true this is the only demerit I have seen .talking about the internet speed it depends on the area in which you live . All around it worth a buy.