My phone keeps telling me about an update that's available, and I always click Reject because I've heard it will disable the mobile hotspot unless I subscribe to a service. Is this true? I've heard it was called the Reboot update, but I bought my phone after this update had already come out. The build number in the About Phone screen is "1.12.605.6 CL338893 release-keys". Should I upgrade my firmware or not?