I am not completely certain regarding enterprise subscriptions, but when adding a non enterprise subscription it does reset the phones that have the subscription added whether you select apply config or not. I would think it would do the same with enterprise subscriptions as well, but even if it doesn't, the subscription won't take effect until you do reset the phone, so at some point you will have to reset the phones. Maybe someone else has seen it differently, but I would do it after hours.
Creating Enterprise Subscription did not reset the phones. However, they require a reset for the service to appear.
Thanks for the help