Hello,
RUT955 L***** and RUT955 M***** supports B3 and B28.
It should work in with B3, but it needs to be checked with the ISP for the coverage, because different bands can be used in different locations.
For 3G Unitel uses 700, 900, 1800 and 2100 MHz and RUT950 H***** supports B1 (2100 MHz)/B5 (850 MHz)/B8 (900 MHz).
RUT955 M***** is the one that would suits your needs the best.