You could purchase a 4G sim card to use whilst you are waiting for your services to be installed. They could be installed tomorrow, next week or next month, or if it's a construction issue there could be an 8 week delay, but that would typically show up on your account as an undetermined date so it's unlikely that. Note that BT have suspended all installations until at least March. With VM things are just going a little slower than usual due to lack of staff.