Low Signal - Require Signal Booster

I am using MTNL-Mumbai Dolphin connection for last 4 years. Recently I shifted to new office where the signal is very low 40-50% due to which I cannot receive calls. (calling party gets out or range message).

The signal is good near the window but in my cabin it is very low.

Is there any device signal booster or other device which I can install in my office or mobile so that signal is increased ?

Regards

Ravi Modi

Something related to you:

Amazon.com: Wireless Extenders YX-500 PCS zBoost Cell Phone Signal Booster up to 2500 Square Feet of Coverage for Home or Office (1900 MHz Phones): Cell Phones & Service

Some thing more relevent for India.

Refer: http://www.cellphonesbooster.com/wir...a-booster.html

i dont know if signal boosters really work for the money you give for them...

it would be important to make an antennae by yourself using a hanger of aluminium, but that trick is only for old phones which had external antennaes..

i think these things work....

that too when a mobile signal jammer can work.

check out the prices..

the link which one of the above guys gave (cant remember his name though- and feeling quite lazy to go through ) says that the device is some 185 U.S bucks..
so its quite expensive toy for me...

btw, what are cheaper chinese counterparts priced at?? any idea??