You open Gmail on your phone and the inbox looks hours — or even days — behind. New emails you can see on your computer aren't showing up on your phone, or the app just shows the same messages it did yesterday. Pulling down to refresh does nothing.
This is one of those problems that looks like a broken app but is almost always caused by something in the background settings. Here's what's actually going on.
Why Gmail Stops Syncing on Mobile
Gmail on mobile depends on a combination of background app refresh, account sync permissions, and a stable connection to Google's servers. When any one of these breaks down, the inbox freezes in place without any error message.
Background app refresh is disabled Both iOS and Android can restrict apps from running in the background to save battery. When Gmail can't run in the background, it can only fetch new emails when you actively open the app — and even then, it sometimes takes 30 to 60 seconds before new messages appear.
Account sync is turned off at the system level On Android, there's a system-level sync toggle that controls whether Google accounts sync automatically. If this is turned off — sometimes accidentally after a software update — Gmail stops receiving new mail in the background regardless of what the app settings say.
Gmail's sync settings are set to the wrong time window Inside the Gmail app itself, there's a sync setting that controls how far back Gmail syncs messages. If this is set to a short window (like 30 days), older messages won't appear — and if the setting got corrupted, recent messages can stop appearing too.
A Google account authentication issue Similar to iCloud, Gmail maintains a background authentication token. After a password change, a security alert, or a Google account update, this token can expire and silently stop sync without prompting you to sign in again.
Step-by-Step Fix
Step 1 — Check system-level sync (Android only)
Go to Settings > Accounts > Google > select your account > make sure "Sync Gmail" is toggled on. This is the most commonly missed step on Android — everything in the Gmail app can look correct while this system toggle is off.
Step 2 — Check background app refresh
On iPhone: go to Settings > General > Background App Refresh and make sure it's enabled for Gmail. Also check Settings > Gmail > Background App Refresh is set to "On."
On Android: go to Settings > Apps > Gmail > Battery and make sure the battery optimization setting is set to "Unrestricted" or "Don't optimize." When Gmail is set to "Optimized" or "Restricted," Android limits how often it can check for new mail.
Step 3 — Check Gmail sync settings inside the app
Open Gmail > tap the three-line menu > Settings > select your account > scroll down to "Days of mail to sync." Make sure this is set to 30 days or more. If it's set to a very low number, increase it and wait a few minutes for Gmail to re-sync.
Step 4 — Remove and re-add your Google account
If the above steps don't work, the authentication token is likely the issue. On Android: go to Settings > Accounts > Google > select the affected account > Remove account. Then go back and add the account again. On iPhone: go to Settings > Mail > Accounts > select your Gmail account > Delete Account, then re-add it through Settings > Mail > Add Account > Google.
Your emails are stored on Google's servers — removing and re-adding the account on your phone does not delete any messages.
Pro Tip: Check If Gmail Is Paused
This is something a surprising number of people trigger accidentally: Gmail has a built-in "Pause" feature that completely stops new mail from arriving in your inbox. When Gmail is paused, messages are held in a separate area and don't appear in your inbox at all — and there's no obvious visual indicator that this is active.
To check on desktop: open Gmail and look at the top right. If you see a banner that says "Inbox paused" or a pause icon near the compose button, that's the cause. Click it to unpause.
This feature was introduced as a focus tool, but many users accidentally enable it through keyboard shortcuts or by clicking an unfamiliar button. If your mobile inbox is behind and your desktop inbox looks normal, this is worth checking first before doing anything on your phone — because no amount of mobile troubleshooting will fix a paused inbox.
One More Thing to Check: Storage Quota
Google gives every account 15 GB of free storage shared across Gmail, Drive, and Photos. If your Google account storage is full, Gmail stops receiving new emails entirely — they bounce back to senders with a delivery failure notice, but your inbox just looks frozen.
To check: go to one.google.com/storage on any browser while signed in. If the bar is at or near 100%, that's your problem. Free up space in Google Drive or Google Photos, or upgrade your Google One storage plan.
Last updated: June 2026. Steps are based on Gmail app version for iOS 18 and Android 15. Menu locations may vary slightly on older versions.
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