when i LOGIN to internet my modem give only speed of 32kb/sec .so how can can i increase my speed ?Simple answer you dont

So...

Get Broad Bandso what do u do to increase ur speed
The speed shown in your connection dialogue box does not indicate the speed of the connection. When your modem and the modem at the other end first start "talking", one of the first things they do is measure the quality of the line. They then guess at the best speed they can get over that connection. This is the speed that you see REPORTED. The actual speed will vary according to internet traffic, the load on your PC, the fluctuating quality of the line, outside interference, etc.

In practice, very few people on dialup see real-world speeds better than about 38kbps. The theoretical maximum is 56kbps towards your computer (from the internet), but somewhat less than that away from your computer (to the internet). The 38kbps is about the best average speed you will see.

The browsing experience can sometimes be IMPROVED by the use of so-called "download accelerators". These do things like downloading other pages in the background that the program guesses you might like to see next, or increasing compression on images (resulting in loss of quality, normally). They don't acutally increase the speed of the connection though.

As panboy said, if you want a faster service, you NEED DSL.