Slack notifications work on desktop but not on your phone?
You leave the computer running and return from a meeting to missed mentions on a silent phone. How do you get urgent Slack requests on mobile without alerts for every channel post?
You leave your computer running, take your phone to a meeting and return to requests you never heard arrive. Reinstalling Slack is tempting, but first open one missed conversation on the phone. If the message is there, the useful question is why it did not alert you.
That question has two parts: which conversations should interrupt you, and when should Slack send those interruptions to mobile? Keeping those choices separate lets you fix an important handoff channel without making every office conversation noisy.
Start with one missed message
Record the conversation, time and device you were using. Was it a direct message, a channel post or a reply inside an existing thread? Check whether someone actually mentioned you rather than simply typing your name in ordinary text.
Also describe what was missing. A banner, sound and numbered app badge are different observations. Slack’s notification guide distinguishes banners from unread indicators and badges. Seeing an unread conversation later does not establish that your phone displayed an alert earlier.
| What you observed | Where to look first |
|---|---|
| Mobile stays quiet while you work on desktop | Mobile notification timing |
| DM alerts arrive, but one channel’s mentions do not | That channel’s mute status and mobile preferences |
| New posts arrive, but later replies are missed | Thread notification preferences |
| The notification is visible, but makes no sound | Phone sound and silent notification settings |
These comparisons narrow your first check; they do not prove a cause. For example, a working DM makes a conversation-specific setting worth checking before changing every phone notification permission.
Check when mobile delivery starts
By default, Slack sends mobile notifications one minute after you lock your desktop screen, or ten minutes after it stops detecting cursor activity. Walking away from an unlocked computer therefore does not necessarily make your phone alert immediately.
On mobile, tap your profile picture, open Notifications and confirm that mobile notifications are enabled. Under Notify me on mobile, select the timing you want. Choose Immediately, even if I’m active if you need alerts while working on desktop; save the choice on Android. Slack documents the timing in Configure your Slack notifications.
This can suit someone moving between a desk and appointments, but it also means receiving alerts on both devices while seated at the computer. If that is distracting, keep mobile delivery set to start when you are inactive on desktop. Immediate timing does not override a muted conversation, your notification schedule or a phone permission that blocks alerts.
Choose alerts for the conversation
A muted channel can still show a numbered badge when someone mentions you. Slack’s mute documentation explains which indicators remain. A badge is therefore a poor way to check whether a conversation was allowed to interrupt you.
If you muted a busy channel but still need requests addressed to you, unmute it and choose mention notifications. On desktop, the notification icon at the top of the channel offers Just mentions and All new posts. On mobile, tap the channel name, then Settings & Details → Notifications.
A handoff channel may deserve a different choice from a general discussion channel. If colleagues post requests without mentioning the next person on duty, all new posts can be useful there. Keep the general channel on mentions if its other conversations do not require an immediate response.
For a desktop/mobile mismatch, inspect the advanced option Get different notifications on mobile. Conversation overrides can also be reviewed under Exceptions to the defaults in notification preferences. Slack’s conversation-specific settings cover channels and group DMs with three or more people.
Follow the replies you actually need
Receiving the original request does not guarantee an alert for every subsequent reply. A channel’s “all new posts” setting is different from following its threads.
In channels and group DMs, Slack normally notifies you about replies to threads you started, replied to or were mentioned in. To watch another discussion, open the thread’s more menu and choose Get notified about new replies. One-to-one DMs differ: their thread replies generate notifications by default. These distinctions appear in Slack’s thread guide.
Suppose you are waiting for revised dates on three requests. Following those three threads keeps subsequent discussion within reach without following every conversation in the channel. There is a separate Follow every thread option for roles that need that wider coverage. If a followed thread is still quiet, also check whether notifications for replies to followed threads have been disabled in your overall notification settings.
Look for a schedule behind the silence
If alerts disappear at roughly the same time each day, inspect your notification schedule. If they stopped after a meeting, check whether you paused them and never resumed.
On mobile, your profile’s Pause notifications menu lets you resume notifications. For recurring hours, open Notifications → Notification schedule. On desktop, use Preferences → Working hours → Allow notifications to choose days and times. A personal schedule overrides the administrator’s default schedule, as explained in Slack’s pause and schedule guide.
Keep your intended quiet hours. Someone covering an evening shift can adjust the relevant days and times without deciding to receive every alert around the clock. Also, an occasional notification during a pause does not necessarily mean the schedule failed: Slack provides exceptions, including a sender’s ability to notify you about an urgent DM once a day.
Check what your phone is allowed to show
On iPhone, open Settings → Notifications → Slack. Check Allow Notifications and the selected alert locations and sounds. A Scheduled Summary or an active Focus can affect when you notice an alert. Apple describes these choices in its notification settings guide.
If the concern is exposing work messages on a locked screen, review Show Previews. Showing content only when unlocked is a different choice from disabling notifications altogether. Decide whether you want notice of a message, its contents, or both visible at that moment.
On Android, start with Settings → Notifications → App notifications → Slack. Check any notification categories offered by the device. A silent notification can remain in the notification shade without making a sound or vibrating. Google’s Android notification guide notes that menus and available features vary by phone. Compare the behavior you want with the setting for that notification, rather than treating every visible badge as a successful audible alert.
Compare the result and report what remains
After a change, ask a colleague to send a short DM and a mention in the channel you are checking, in the same workspace. Note each send time and whether your phone displays a banner, makes a sound or shows only a badge. Record desktop activity when checking mobile timing. If the original problem involved replies, include a reply in a followed thread.
Change one relevant setting at a time. A DM that works while a channel mention fails is more useful evidence than a blanket statement that Slack is unreliable. Likewise, banners arriving without sound point to a different remaining problem from nothing appearing at all.
If the problem persists, restart the phone and run Notifications → Troubleshoot Notifications from your Slack profile. Follow the platform-specific results; Slack’s iOS and Android instructions do not prescribe an identical reinstall sequence. Android also requires Google Play services. Use Send a report if the diagnostic does not resolve the issue. The official troubleshooting guide contains those next steps.
Include your phone model, OS and Slack versions, diagnostic result and a precise comparison: for example, a DM produced a banner at 2:10 p.m., while a channel mention at 2:12 p.m. was discovered only after opening the app. Add whether the computer was active. You can give support a reproducible observation without claiming to know the cause.