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In Samsung Duos259, there is no CDMA data usage settings, internet browser is through GSM operator only. Also it has only a generic browser,'opera' will not work in it. In Samsung DUOS TOUCH (SCH W299), CDMA browser is present but only a generic browser and no 'opera' as in Duos259. If you can satisfy with CDMA+GSM single standby phone without a R-UIM slot, you can opt for BlackBerry 8830. But these phones are not economical and cost effective.The new entrant in CDMA+GSM dual standby category is Micromax GC400 ( http://www.micromaxinfo.com/products/gc400.html ) with 3 mega pixel camera for Rs 5000/- But I suggest you to buy two handsets, one CDMA EVDO Rev A handset like LG510 for high speed data usage( http://www.lg.com/in/mobile-phones/all-phones/LG-LG510.jsp ) and one Nokia GSM basic handset. You can buy both this handsets for Rs 9,000/- while Samsung Duos Touch alone costs more than 10,000/-

Well Well Well in GPRS or EDGE a Whole Tower have Dedicted EDGE card which have Dedicated Spectrum assigned to it so EDGE or GPRS Trafiic can never disturb Voice. in CDMA 1x Data Session is done on Pure Voice Channel so more and more Voice User chocks Voice Network so if Expensive 1x and Cheaper GPRS or EDGE. a BTS can support upto 2 to 5 mbps on 1x to Different users but a Typical GSM BTS can support only 280 kbps (Subject to one slot Suport) to whole users under same BTS. So Comparing it is not Proper.