Hey there,
Perhaps try a reboot (the old turn it off and on again :))
If that doesn't work, you may be facing another issue, in which case, it may be beneficial to search our help content - usually this helps resolve things.
Hi There,
If you have no service because you are an impacted VoLTE enabled phone customer, you should have service very shortly, which would mean everything (including call forwarding) should be working.
Thank you,
A