Simply I bought a tata photon max wifi. Because I am getting 256kbps speed even thought I am in full coverage. Instead you can use airtel or vodafone 2g services.I have selected a 20 GB plan but you cannot download single GB in a day.
But during demo they showed me in my area it is getting 1mbps download speed I dont know whether they cheated me.Now I wasted Rs 2000 because I am not able to use this device for other service providers.