I have the BSNL broadband wireless modem, make: ITI, model: DNA-A211-1, which was functional in BSNL network area. Now I have moved in to Mumbai and the modem won't work with MTNL phone. Could anybody give me the step by step guidance to change the inbuilt configuration set for BSNL network so that I could use the wireless modem for MTNL broadband network?