Where is that option???
The MTNL blue box is always showing 'Searching...' with red bar in the black box
ont he top left and sometimes shows 1/4th green bar and UMTS..that's all
Well I guess All Modem Have Different config page so AS does MTNL
For me i have
Huawei E355 modem
3g Mode can be found on
either if you can enter like normal modem login page
as
192.168.1.1
MObile network Setting -> Network -> 3g preferred or 3G only MOde or some as GSM etc etc
Really MTNL 3g is awful service some times i get or sometimes i dont
avg Good 3G speed wg=hat i got outdoors is somewhere around 550-650kbps download speed as m having unlocked huawei modem that support 21MBPS speed
so as for your case
You are having 3.1MBps
Roughly it should support Download speed upto 300-350kbps
As mtnl have upgraded there speed but not the 3G modem
so currently modem speed support upto - 3.1mbps
but
mtnl current speed which is showing from multiple sources somewhere 7.1 mbps ie
800-880kbps
may be speed gets upgraded in near future to 21 mbps depn upon mtnl aunty`s
m sorry i couldnt reply earlier i dont got any quote notification