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You can check whether someone is reachable on Signal by searching a phone number you already have or by matching your contacts. That works only if the person’s privacy settings allow discovery by number. If they cannot be found that way, ask them to share their exact Signal username. Search results and message indicators cannot reliably tell you whether someone is currently online.
Try a phone-number search first
In Signal, use the option to start a new message and search for the person’s full phone number, including the country code if needed. If Signal finds an eligible account, you can start a conversation. You can also allow Signal to match your address-book contacts; eligible Signal users may then appear in the app’s contact list.
Contact matching is not a public directory. Signal says its private contact-discovery process lets the app identify which address-book contacts use Signal without revealing the address book to Signal’s service. Contact-join notifications are generated on your phone.
Why a number may not find them
Signal’s “Who can find me by my number” control determines whether someone who knows a person’s number can find them by entering it in Signal. Signal Support says the default is “Everybody,” but a user can choose “Nobody.” If they have chosen “Nobody,” a number search will not reveal that they use Signal. A missing result therefore does not prove they lack an account.
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Finding someone by number and seeing their number are separate privacy controls. A person may limit who can see their number in profile details while still allowing discovery by number, or disable number discovery independently. Someone who already has a person’s number saved may know it regardless of the profile-visibility setting.
Ask for an exact username if number search fails
A Signal username is an optional way to initiate contact without sharing a phone number. It is not the same as a profile name, and Signal does not provide a searchable username directory. To start a username-based conversation, you need the exact username the person shares, including its numbers.
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Signal describes a username as “a way to initiate contact on Signal without sharing your phone number.” If you cannot find someone by number, ask them to send their exact username through a channel you already trust. A guess, display name, or partial username is not a reliable substitute.
| Method | What you need | What can prevent discovery | Does it require their phone number? |
|---|---|---|---|
| Phone-number search or contact matching | Their phone number, or their number saved in your contacts | They may set “Who can find me by my number” to “Nobody” | Yes |
| Username search | The exact username, including its numbers, shared by the person | You do not have the exact identifier; there is no searchable username directory | No |
Do not use message indicators as an online-status check
Typing indicators and read receipts provide limited information about a conversation, not a dependable presence status. Both people must enable typing indicators to see them. Read receipts likewise appear only when both people have enabled them. Signal Support describes typing indicators this way: “Both you and your contact must have this feature enabled to see this status.”
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If you do not see typing dots or a read receipt, that does not establish that the person is absent, inactive, or not using Signal. Those indicators may be disabled, and their absence is not proof of anything about account status. Even when an indicator appears, it is not a general guarantee that the person is available to chat.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Separate account discovery from identity verification
Finding an account does not prove who controls it. Signal says profile names are not verified, so do not treat a familiar name or photo as confirmation of identity. For an identity-sensitive conversation, compare safety numbers, ideally in person, or confirm the person through another trusted channel.
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A missing search result cannot reveal whether someone has hidden their account, disabled number discovery, or simply has not shared their exact username. Avoid third-party services claiming to track Signal accounts or uncover hidden users: the supported discovery options are Signal’s in-app contact and privacy features, and they do not establish someone’s current online presence.
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