Access ControlFor Property Managers

Phone Credentials vs. Key Fobs: Is It Time to Switch?

Your tenants never leave home without their phone. They lose fobs all the time. Mobile access sounds like the obvious upgrade, but it has real trade-offs. Here is what gets easier, what gets harder, and how to switch without leaving anyone stuck at the door.

PAX Security6 min readJuly 31, 2026

Quick Answer

Phone credentials let people unlock doors with an app instead of a plastic fob. They make lost fobs and slow turnovers mostly go away, and you can add or remove someone in seconds. The trade-offs are dead batteries, residents who do not want an app, and the need for a backup way in. For most buildings, the right move is phones as the main option with fobs or a PIN kept as a fallback.

Key Takeaways

1A phone credential is just a digital key that lives in an app and talks to the door reader
2The biggest wins are no more lost fob replacements and instant add or remove from anywhere
3Dead phones, older residents, and people without smartphones mean you always need a fallback
4Many buildings run phones and fobs side by side instead of forcing everyone to switch
5Whether your current readers support phones decides whether this is a small upgrade or a bigger project

Count how many fobs you replaced last year. Now count how many times someone moved out and you were not totally sure their fob got turned off.

If either number made you wince, you have probably wondered about phone access. The pitch is simple: people already carry their phone everywhere, so why hand them another piece of plastic to lose?

It is a good question. The answer is usually yes, but not in the way most people picture it.

What phone access actually is

With phone access, each person gets a digital key in an app on their phone. When they walk up to the door, the reader recognizes the phone, usually through Bluetooth, which is the same short-range wireless your earbuds use. Depending on the setup, they tap the phone, wave a hand at the reader, or just walk up with the phone in their pocket.

Behind the scenes, it works like a fob. Each person has their own credential, and every door opening gets logged. The difference is how you hand it out and take it back.

What gets easier

This is where phones really shine for a property manager.

No more lost fob runs. Residents do not leave their phone in a jacket at the gym the way they leave a fob. When they get a new phone, they just log in again.
Instant revoke. A tenant moves out, you remove them from the app, and they are done. No chasing the fob, no wondering if they made a copy.
Remote move-ins. You can send a new resident their access before they arrive, so you are not meeting someone in the lobby at 8 p.m. to hand over plastic.
Fewer shared fobs. When every person has their own phone credential, nobody needs to borrow a roommate's fob. Your logs show who actually came in.
Guests and vendors. Many systems let you send a temporary key that expires on its own.

For buildings with a lot of turnover, that last point about instant revoke is the big one. The weakest moment in any access system is move-out day, and phones make it much easier to close.

The honest downsides

Phones are not perfect, and the vendors selling them do not always lead with the problems.

Dead phones. Someone comes home late, their battery is at zero, and the front door will not open. That will happen.
Not everyone wants an app. Some older residents do not have a smartphone or do not want another app. That is their right, and you still have to let them in.
Phone settings. Bluetooth turned off, the app logged out after an update, a new phone that was never set up. Expect a few support calls in the first month.
Shared phones and kids. A teenager without a phone, a caregiver who visits daily, a family that shares one device. Real life is messy.

Some phones can keep a digital key working for a while even after the battery dies. It depends on the phone and the access system, so do not promise it to residents unless you have tested it with your setup.

You need a fallback, always

The buildings that switch smoothly do not force everyone onto phones on day one. They keep a backup:

Fobs or cards for anyone who wants one or cannot use the app
A PIN pad option at the main entrance
A working intercom so a resident can buzz the super or a neighbor

Running phones and fobs side by side is normal. Most residents will move to the phone on their own once they see how easy it is. The fallback is there for the night someone's battery dies and for the residents who never want to switch.

How to know if you are ready

Start with your current hardware. Some readers can accept phone credentials with a software change. Others are old enough that the readers need to be replaced. That one fact decides whether this is a quick upgrade or a real project.

Then think about your building. A newer rental with lots of turnover and younger tenants is an easy yes. A co-op with long-term residents may want phones as an option rather than the default.

Before you roll it out, pilot it with staff and a handful of residents for two weeks. You will learn where the setup instructions are confusing and which doors need a reader adjusted before the whole building is relying on it.

What a smooth switch looks like

The buildings that do this well tend to follow the same pattern. First, staff and the super switch over, because they know the doors and will find the problems fast. Then the new phone option gets offered to residents, with a simple flyer in the lobby and a one-page guide with screenshots.

New move-ins get phone access by default, with a fob available on request. Existing residents switch when they are ready. Over a few months, most of the building moves over on its own, and the fob drawer gets a lot lighter.

Along the way, keep an eye on a few things:

Which doors get the most complaints. A reader in a spot with weak signal or an awkward angle may need to be moved.
Who keeps calling for help. Usually it is the same few residents, and a five-minute walkthrough in the lobby fixes it.
Whether old fobs are being turned off as people switch. If not, you have doubled your credentials instead of replacing them.

Give it a full season before you judge it. The first month is always the bumpiest.

The goal is not to get rid of fobs because phones are newer. It is to make move-outs clean, cut down on lost credentials, and know who is coming through your doors. Phones help with all three, as long as nobody gets stuck outside.

The weakest moment in any access system is move-out day. Phones make it much easier to close.

Your Checklist

Count how many fobs you replaced in the last year and what each one cost you in time
Ask your installer whether your current readers can accept phone credentials
Decide on a fallback for dead phones: fob, PIN, or intercom
Pick a small group of staff and residents to test it for two weeks
Write a one-page setup guide for residents with screenshots
Set a rule that every move-out includes removing the phone credential the same day

Common Mistakes to Avoid

Forcing everyone onto phones on the same day

Some residents will not or cannot use the app. Without a fallback, you end up with angry calls and propped doors.

Assuming the old readers will just work

Many older readers cannot read phones at all. Find out before you budget, not after you announce the change.

Leaving old fobs active after someone switches to their phone

If a resident moves to the app, turn off the fob they no longer use. Otherwise you have doubled their credentials instead of replacing them.

Frequently Asked Questions

Is phone access less secure than a fob?

Generally it is as secure or more, because most phones are locked with a passcode or face ID and the digital key cannot be easily copied like some older fobs. The bigger security gain is that you can remove access instantly.

What happens when a resident gets a new phone?

They usually download the app and log back in, and the key moves over. Some systems ask the manager to reissue it. Either way it takes minutes, not a trip to the office.

Do residents need internet to open the door?

In most setups, no. The phone talks directly to the reader at the door. Internet is needed to receive or update the key, not every time someone walks in.

Can I keep my fobs and add phones?

Often, yes. Many systems run both at the same time on the same doors. That is the setup we recommend for most buildings.