That's just EARFCN value.]Why Jazz's download frequency is in 1800 range and Zong's in 1500 range? Should not both be in 1800?
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1597 EARFCN means 1844.7 MHz (downlink) and 1749.7 MHz (uplink).
In your case, Jazz has not done spectrum shuffle in FSD yet since they're still using old EARFCN of 1836 which means 1868.6 / 1773.6 MHz.
In RWP/ISB, they're using EARFCN 1818 which is 1866.8 / 1771.8 MHz.
I use this app to calculate frequency based on EARFCN:
https://play.google.com/store/apps/details?id=com.lteapps.earfcncalculator