Ga. R. Prob. Ct. 3.3.11
When an attorney has already filed an entry of appearance and the client wishes to substitute counsel, it will not be necessary for the former attorney to comply with Rule 3.3.2. Instead, the former attorney may file with the clerk a notice of substitution of counsel signed by the party and the former attorney. The notice shall contain the style of the case and the name, address, telephone number and bar number of the substitute counsel. A copy of the notice shall be served on the substitute counsel, opposing counsel or party if unrepresented, and the assigned judge. No other or further action shall be required by the former attorney to withdraw from representing the party. The substitution shall not delay any proceeding or hearing in the case.
Ga. R. Prob. Ct. 3.3.11