|nothing you can do on the pc is going to make any difference if the issue is with the line. You start there first.|
Used to be there were toll free numbers you could call to test your modem. Google usr or your modem brand to see if they have a test phone number. The test will tell you the baud rate connected.
Call the telephone company and ask them to test your phone line. Say you are having static and see what they might find.
If your phone line is multiplexed [line is also used by others outside your house] the best you will get is 28k. Phone company will make it very clear they guarentee voice but not data.