A hotel key card system can now support several guest experiences: a physical card, a credential inside a hotel app, or a key in a phone’s mobile wallet. These are not interchangeable descriptions. The right comparison is between the complete arrival paths each architecture enables, including the guest who still wants a card.
This guide compares those paths for hotel owners considering an access-system refresh. It is not a list of recommended lock brands. A property can have attractive new door hardware yet an awkward arrival process, or keep suitable existing hardware while improving how credentials reach guests. Separating the credential, reader and software layers makes that distinction easier to understand.
Why the room-key conversation is changing
On September 22, 2026, Virdee announced an expanded Salto integration for qualifying hotels to issue room keys into mobile wallets. The announced experience uses NFC: an eligible guest presents a phone or watch to a compatible reader without opening an app at the door. The integration connects digital check-in with access issuance; it is not a promise that every existing Salto installation supports the service.
A second announcement points in the same direction. In its September 15 release, dormakaba said it had signed an agreement to acquire Alliants, combining its access business with guest-experience software. The company described continued interoperability with other providers. Closing remained subject to regulatory approval in that announcement. This is industry context, not evidence of a completed transaction, a brand mandate or a JET customer installation.
Cards, app keys and wallet keys solve different parts of arrival
Physical cards give the property a credential it can hand to a guest. They remain useful for people without a supported phone, guests who prefer not to use digital check-in, and situations needing a staffed alternative. The tradeoff is physical issuance and replacement. An efficient digital experience should not make those guests feel like an exception the front desk cannot handle.
App-based mobile keys place the access experience inside a hotel or provider application. They can make sense when guests already use that app for other services. For example, Salto’s Virdee partner description explains an SDK-based guest-app and kiosk integration. The specific system determines the radio technology, device requirements and steps at the door; “mobile key” alone does not describe them.
Wallet keys move the credential into a supported device wallet. NFC can make the action at a compatible door resemble presenting a contactless card. However, “no app opened at the door” does not mean “no app anywhere in setup.” Apple’s hotel-key instructions include a participating property, an eligible device/account setup and the hotel or resort app. Express Mode can simplify entry once configured; supported-device power reserve is not a universal dead-battery guarantee.
Compatibility is a system property, not a logo on the lock
A mobile-wallet logo on a sales slide is only the start of the architecture discussion. Consider the door reader, access software, credential provider and reservation-to-room integration as separate layers. A reader may support one credential technology without supporting every software service that uses a phone.
Salto’s Space wallet-key documentation, for example, identifies licensing, software-version and credential-provider configuration requirements. That is useful evidence of why wallet readiness cannot be inferred from a generic “smart lock” label. Requirements differ by platform and deployment; these details should not be generalized to all manufacturers.
Guestroom doors are also only one part of a stay. An arrival path can include an exterior entrance, elevator floor access and shared amenities. A useful property-level comparison maps each of those locations to its actual reader and permission model. Otherwise, the guest may enjoy a phone key at the room but still need a card to complete the journey.
A renovation can separate credential change from door replacement
For an operating hotel, there are at least three possible project shapes: improve issuance while retaining supported hardware; upgrade a limited set of readers and software; or replace the access platform as part of a larger renovation. None is automatically the lowest-cost option. The answer depends on existing equipment, required guest experience and the physical work needed at each opening.
JET’s hotel low-voltage services are relevant where that access scope meets the building’s supporting infrastructure. Our project-planning lens is to separate the physical work from the software and guest-facing outcome. That makes it possible to compare two proposals that describe the same digital-key ambition but assume different existing conditions.
For example, a phased property could introduce a new credential experience in one wing while another retains cards. This is an illustrative planning scenario, not a claimed JET installation. Its value is revealing the transition: how a room move crosses the two environments, what happens at a shared elevator, and whether the front desk can explain both paths clearly.
Judge the complete stay, not just a successful tap
A door-opening demonstration answers a narrow question. The broader comparison includes a changed room assignment, a late checkout, a second authorized guest and a lost device. These situations expose how reservations and access permissions relate over time. They also distinguish a smooth guest service from a technically impressive isolated feature.
Keep a workable physical-credential and staffed-assistance path in the design. The hotel’s after-hours technology support plan should cover a guest who cannot use the preferred digital route. That is not an argument against mobile access; it is how a hotel can offer convenience without requiring every guest to use the same device or journey.
The meaningful question is no longer simply whether a hotel key card system supports phones. It is which arrival and stay experiences the property can reliably deliver with its installed infrastructure. Discuss your access-system and low-voltage scope with JET when planning a renovation, conversion or new build.