The phrase "bell service" refers to a service provided by hotels or other establishments where staff assist guests with tasks like carrying their luggage or delivering items to their room. Full definition
Everything from bell service, check - in, room layout, amenities provided, housekeeping, check out to luggage storage, is top - notch. (okurabangkok.com)
Free delivery but you must meet them in person to receive the delivery (they can't leave items with bell services) (strollerspotter.com)