InFocus — Mobile not getting connected to BSNL

Address:	600053
Website:	All website,Mobile fails to join BSNL network.

I bought a InFocus 333 mobile and from the day one it does not get connected to BSNL network.while it gets connected to all other networks why it will not get connected to BSNL.I contacted BSNL office and despite their resting of the modem the problem continues.Neither sale outlet Poorvica at Ambattur is able to resolve this, Thus I am totally deprived of BSNL network on this phone only.All other gadgets I have namely two I Pads, a I phone and the computer is joining BSNL network without any problem.
Please resolve