If u r talking of reliance broadband+, then plz dont consider airtel and vodafone datacards in ur talks... as they r slow speed datacards.. they can provide only speed upto 250 kbps... it is not downloading speed. downloading speeds are even much less than these..
I m using reliance HSD( high speed datacard) which can provide speed upto 3.1 Mbps as co say like this..... this is true that 3.1 Mbps speed cant come, even in ideal conditions.. but u will get speed by which u will b satisfied.. if u want to download anything, want to chat with anyone..u will b able to do.
Reliance broadband+ is based on CDMA technology, so the signals will not get disturbed from the GSM signals which r present in large amount in this country, ... its working frequency is different , it works on 2100 MHz band.. its also more secure than others signals, , well , every person has its own level of understanding, but I want to say that HSD is different from others like airtel, vodafone, even from reliance 1x......