Open Desktop Authenticator

Steam Guard without a smartphone

Reviewed by MASTERPANEL LLC 5 min read Sources and testing: No-number setup checked against Valve's enrolment guidance; the email-code path includes one labelled no-number account observation Editorial method

Two different questions hide inside this one, and mixing them up is why the answers you find online contradict each other. One is about the device that generates codes. The other is about the phone number on your account — and the second has an answer most people do not expect.

Two different things, and only one of them is required. Valve's official mobile authenticator runs on a supported Android or iOS device, so without one of those the official app is not an option. A phone number, however, is optional in Valve's current setup flow — its own guide includes a way to skip that step. The rest of this page separates the two.

Short answer

Two separate questions get tangled together here. Valve's official authenticator app does require an Android or iOS device — there is no official desktop version of it. But a phone number is optional in Valve's current setup flow. Generating Steam Guard login codes needs a secret and the correct time, so that part can run on a desktop; trade confirmations additionally need an identity secret and an authenticated Steam session.

Skipping the phone number removes SMS recovery. Keep the recovery code; if you use a desktop authenticator, also keep a usable protected backup.

Question 1: does the authenticator have to run on a phone?#

No. Generating login codes requires a secret and the correct time, so that function can run on a desktop; trade confirmations additionally require the identity secret and an authenticated session. That is what desktop authenticators are, and they have existed for years. But note this is a replacement when you transfer from the phone: Steam allows one enrolled authenticator on an account at a time. A copied desktop secret is still the same authenticator.

Question 2: can the account have no phone number at all?#

Yes. Valve's current setup walkthrough documents an enrolment path for people without access to a phone number, and says so directly:

In Valve's setup walkthrough, select I don't have access to a phone number beneath the Next button to use the documented no-number option.

So a number is not a hard requirement in Valve's current setup flow for attaching an authenticator. Steam still asks for one first, and still recommends it — Valve's step for entering a number explains why, since it is what lets you recover the account by text later. But there is a documented way past it.

This matches what we see. Our own enrolment decides from Steam's response whether to expect the activation code by SMS or by email rather than assuming SMS, and one recorded live run against an account with no phone — on 10 August 2026 — completed with the code delivered by email. That is a single observed account flow rather than a guarantee, but it is consistent with the documented path above.

To add or update a number, use Steam's Account Details → Contact Info → Add a phone number or Manage your phone number. ODA does not manage the number for you.

Can I just use Steam Guard by email?#

Yes. Valve recognises email Steam Guard as an account-protection method. It does not require a smartphone or a desktop authenticator. If you only need sign-in protection and can secure your email account, this may meet your needs. Standard trade and Market holds can apply without an established mobile authenticator; CS2 Trade Protection and account restrictions are separate.

What do I lose by not having a phone number?#

Skipping the number is supported for authenticator setup. It does not guarantee access to every game feature or other phone-gated Steam feature. For recovery, the main differences are:

So the recovery code stops being good practice and starts being the plan. Without a phone number, your self-service fallbacks are a working backup of the authenticator or the recovery code. Without either, the remaining route is Steam Support.

What if I have a phone but will not install the app?#

A desktop authenticator is one option, and a linked number can preserve Steam's SMS recovery options. You then manage the secrets and backups on the PC, and trade confirmations need an internet connection and Steam session. If an authenticator is already on the account, check the transfer requirements before changing anything. Email Steam Guard is another option if its limitations fit how you use the account.

Can I remove the phone number after adding an authenticator?#

Valve documents removal in Account Details → Manage your phone number → Remove number. Read Steam's warnings before confirming. Removing a number and removing the authenticator are different actions; losing the number removes the SMS recovery option.

Can two accounts share one phone number?#

Valve says yes — the same number may be used on multiple accounts. Valve also warns that linked accounts may be treated as the same identity for policies or restrictions, and some games apply VAC or game bans across accounts sharing a number. Consider that consequence before sharing one.

Does a landline or VoIP number work?#

Steam sends codes by SMS, so a number that cannot receive text messages is not useful for this, and Valve says it does not accept new VoIP numbers. If the number is the obstacle, the no-number option above is the cleaner route.

What am I taking on with a desktop authenticator?#

Responsibility for a file and for the device that can read it. The mobile app manages its own credential storage; a desktop tool gives you backups that you must protect against loss and disclosure. Open Desktop Authenticator keeps it encrypted locally and locks itself when idle, but malware can compromise an unlocked PC — and if a smartphone is genuinely an option for you, the official app is still the simpler answer.