When an attorney has been retained, he has an ethical obligation to make all court appearances on his client's behalf. While it is a bit disconcerting that he has not returned your calls, I would suggest that it is improbable that he stopped making your court dates.
Having said that, it is imperative that you actually speak with him. I would suggest stepping up your efforts, whether calling by phone, sending an email or even mailing a letter. One way or another, you need to actually get in touch with him to confirm that he is still working the case and to check on case progress.
As to the ultimate outcome, it is a bit difficult to predict. However, assuming you have little to no criminal history, then a likely outcome would include fines and costs and perhaps a short term of probation.
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