You should have an attorney to look at the motion against you, and draft answer with defenses etc. I do not know about attending by phone. You can call the court coordinator and explain your situation and ask if that is possible. If wife is trying to enforce support through criminal contempt (or you have chance of being incarcerated), you are entitled to court appointed attorney if court determines you are indigent. But you get appointed attorney etc. after you appear.
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Since you are facing jail time if held in contempt, you can request and the court should appoint counsel to represent you. The attorney can also file a motion for you to testify telephonically.Ask a similar question
Child support Criminal defense Right to counsel in criminal cases Child support arrears Child support modification Child support and changes in circumstances Child support enforcement Enforcing child support by contempt Penalties for not paying child support Lawsuits and disputes Contempt of court