In this paper, the performance of WiMAX for Voice over IP (VoIP) by applying different mobility patterns is analyzed for good sectors and bad sectors. The performance is analyzed by using OPNET modeler. The performance is compared in terms of load and throughput. The results show that the performance of G.711 is better than other codes. The result also shows that the performance of Random walk is better in most of the cases. The result also shows that with increase in packet voice per frame the load and throughput decrease.