After upgrading from 3CX Client for Android 15.0.23, January 2017 to 3CX Client for Android 15.0.71, March 2017, I get much slower to Initialize and Connect experience and Provisioning Errors when starting the client and when switching between Accounts. 3CX Server 14 Service Pack 2 Build 47020.408 (yeah, i know it's older, but client 15.0.23 worked fine) Samsung S7 Android 6.0.1 Much slower to Initialize and connect to server. What's happening is the app say "Loading provisioned profile" while it hangs for 20 long seconds (arrow spins in a circle) then says: Provisioning Error Cannot contact provisioning server because of a network issue. Yet, the client does get provisioned with the account detail. 3CX Client for Android 15.0.23, January 2017 didn't have these problems. Seems to me the "fix" put in 15.0.71 broke other stuff. https://www.3cx.com/blog/change-log/3cxphone-android-build-history/ Fixed auto-provisioning on startup – you can enable / disable from 3CX console BTW, I'm providing all this detail so 3CX can troubleshoot themselves.