Can an iPhone emulate an access badge?
Only where the access system was built for it. Card emulation on iPhone exists on Apple terms, through arrangements with the operator, rather than as something an ordinary application can improvise. The deciding factor is the reader you present to, not the phone in your hand.
The capability exists
An iPhone can behave as a card. That is what happens when you pay, and it is the same mode used by transit and by the credentials people keep in a wallet application.
So the answer to whether an iPhone can act as a badge is not a hardware no. The hardware does this every day.
What is constrained is who may use it and how.
On whose terms
Apple governs which credentials may be emulated and through what arrangement. An access system does not gain the capability by writing an application, it gains it by entering the process Apple defines.
Since iOS 18.1, and for some card types since iOS 17.4, that process has a name: the NFC and SE Platform. An app granted Apple's entitlement, under a commercial agreement, can present cards that explicitly include corporate badges, in a set of supported countries. This is the same arrangement made concrete, card emulation on Apple's terms, not an open capability any application can reach.
That is a commercial and contractual question as much as a technical one, and it is why some building systems support phones and superficially similar ones do not.
It is also why the Android answer and the iPhone answer differ. Android exposes host card emulation to applications directly, with the trust implications that follow.
The reader decides
Even where a phone may emulate, the reader has to accept what it presents.
A reader that checks a credential against a server can be satisfied by a phone. A reader that authenticates against a card's own hardware, as many legacy access systems do, cannot be satisfied by anything that is not that card.
So the useful question is not what phones can do. It is what your readers actually verify, which the system integrator knows and you probably do not.
Asking that first saves a great deal of investigation into the wrong half of the problem.
What to ask before promising
What do the readers verify: a number, a server response, or something the card proves in hardware?
Does the manufacturer support phone credentials at all, and on which platforms?
What happens to people without a supported phone, since a badge system that excludes some staff is not a system.
And what the fallback is when a phone is flat. A badge that depends on a battery has a failure mode plastic does not, and any serious deployment plans for it.
Frequently asked questions
Can I copy my office badge to my iPhone?
Not by copying it yourself. Most access systems check something the badge proves in hardware. iPhone emulation is gated by Apple, open since iOS 18.1 to apps granted its NFC and SE entitlement, including for corporate badges, but not to arbitrary apps.
Why can Android do more here?
Android exposes host card emulation to applications directly. That is a different trust model rather than a more capable one.
Do any buildings support iPhone badges?
Systems designed for it do. The determining factor is the access system and its reader, not the phone.
What if my phone battery dies?
That is a real failure mode a plastic badge does not have, and it is worth planning a fallback before deploying phone credentials.