I am having an idea of purchasing Dual SIM(GSM+CDMA) mobiles with long lasting battery life.Most of the time i will be in calls n using to handsets n it s very difficult to carry,charging. 
So i am planning to go for dual sim mobiles from Karbon,Micro max,Maxx n few other manufacturers who provide these kind of mobile phones for lower price. 
But when i had gone through complaint,consumer site i had read lot of complaints regarding these kind of mobiles. 
suggest me a good model with long lasting battery n price below Rs4000