Booking.com stopped passing guest phone numbers to connected hotel systems on 28 September 2026. The change covers reservations that arrive through a property management system, a channel manager or a guest messaging platform. It applies to new reservations and to changes made to existing ones.
Booking.com's partner email states that phone numbers will no longer be transmitted automatically through connectivity channels from that date, worldwide. The number stays visible in the Booking.com Extranet and in the Pulse app, where a desk can look it up one reservation at a time.
The platform gives phishing messages that carry real booking details as the reason. That is Booking.com's stated rationale, and it appears in the partner email.
What still works
Booking.com messaging keeps running. The masked guest email address keeps running. Numbers a property already holds stay in place.
A qualifier sits on that last point. A saved number can disappear when a reservation is updated, which puts the same gap on a booking the desk thought it had covered.
Direct bookings carry no change, because the change is scoped to connectivity channels.
Where the gap opens
WhatsApp carries the pre-arrival message at many properties. It carries the check-in link, the door code and the upsell offer too. A journey with no number behind it has no destination.
The guest then receives a plain email through Booking.com messaging, or nothing at all. The operating cost sits beside that: fewer online check-ins, fewer upsells and more questions at reception.
Five steps to keep the channel open
These are Bookboost's recommendations. Alisa Kholmov, head of marketing at Bookboost, wrote the column, and it publishes no result set behind them. Kholmov's column ran on Bookboost's own blog on 7 October 2026 and at eHotelier on 19 October.
First, add email as a fallback on every automated message that goes to a Booking.com guest. The masked address still reaches the guest, and the column puts the work at minutes.
Second, send a short form shortly after the booking. Ask for a phone number, an email address and a preferred channel, with consent, and keep the field count low for a phone screen.
Third, send the WhatsApp welcome as soon as the form comes back.
Fourth, invite the guest to open the conversation. A WhatsApp link in the pre-arrival email and QR codes at reception and in rooms put the guest first in the thread, and the column places a free reply inside WhatsApp's 24-hour window.
Fifth, track two figures per property: the share of Booking.com reservations that carry a phone number, and the form completion rate. The column routes a low completion rate to the form's introduction sentence before any other change.
Two more rules in the column
For a guest waiting at 1 am, look the number up in the Extranet. The column warns against copying numbers across in bulk and ties that warning to the data movement the platform change targets.
Consent covers service messages only. A phone number is not permission to market, and the column asks for promotional permission held separately from the arrival details.
What the record leaves open
Booking.com's partner site returned HTTP 202 with an empty body on three paths on 19 October, including the help index and the guest-communication path. The platform's own statement of the change therefore reaches this piece through the partner email and through the distributors that reproduced it.
28 September 2026 was the worldwide cut-off. AirHost's help centre documents a Japan-only cut-off from 26 June 2026 for properties in Japan, so the change ran as a rolling rollout.
The 24-hour reply window belongs to Meta's WhatsApp platform. The column cites it without a linked source, and the Booking.com decision leaves it unchanged.
What to write down before a journey changes
List every journey that runs on WhatsApp or SMS alone today, and record where the email fallback lands. The masked address is the destination every property holds.
Put the consent sentence into the form and keep service sends and promotional sends in separate lists. A guest who shares a number for a door code has agreed to a door code.
Set the two per-property figures this week, before the first full post-change month closes. The phone-number share sizes the gap at that property. The completion rate sizes the repair.