If it's not shortly before trial, you should be able to change lawyers at will, though you should call the judge's clerk to check. If the trial is about to come up, you would have to make a motion and get the judge's approval: courts are reluctant to allow changes in attorney soon before trial, because that disrutps and delays the case. When you do speak to the judge's chambers (the clerk or someone else in the judge's office) to see if need to make a motion or not, stress the conflict with your lawyer and lack of communication; if they do require a motion, make sure to put that into the motion papers.