I dont think ur quality would improve if u upgrade, bcoz VOIP normally uses 10 - 40kbps per second.Try stopping all background downloads, surfing and only do calling..the quality would improve. Moreover, all VOIP including the one ur using is all prohibited for use by QTEL.when i asked them what will be the action if they find out, they told me that they will inform the police abt the user.hope info was useful