JustfixemailGmail Not Syncing on Android/iPhone
This is one of the more forgiving problems I cover — most of the time, one of these steps clears it up fast.
1. Check your internet connection
Open any other app that needs data — a browser works fine for this. Broken there too? Not a Gmail problem, it's your connectivity.
2. Manually force a sync
- Open the Gmail app.
- Pull down on the inbox list to refresh.
- Nothing happens? Close the app fully and reopen it.
3. Seeing "Primary sync is off. Turn on in Inbox settings"? (Android)
This exact message is Gmail telling you the sync toggle for your Primary inbox category has been switched off — it's a plain setting, not a sign of a deeper account problem, and it's the most common reason new mail simply stops arriving on Android.
- Settings → Accounts → select your Google account.
- Make sure Gmail sync is toggled on.
- Tap Account sync → three-dot menu → Sync now.
- Still seeing the message after that? Open the Gmail app itself → Settings → your account → Inbox categories, and confirm Primary is checked/synced there too — Gmail has two separate sync switches (the phone's account sync, and the app's own inbox-category sync), and either one being off alone is enough to trigger this message.
4. iPhone: check Mail Fetch settings
- Settings → Mail → Accounts → Fetch New Data.
- Confirm Push is on, or Fetch is set to a short interval — not Manual.
5. Clear the app's cache (Android only)
- Settings → Apps → Gmail → Storage → Clear Cache — not Clear Data, which wipes local settings you'd have to redo.
6. Remove and re-add the account
This fixes the vast majority of persistent sync failures I've seen. Your mail stays safely on Google's servers the entire time — removing the account here only removes the local link between it and your phone.
- Settings → Accounts → select account → Remove account.
- Reopen Gmail and add the account again, completing every sign-in and permission prompt fully.
FAQ
What does "Primary sync is off. Turn on in Inbox settings" mean?
It means the sync toggle for your Primary inbox category is switched off, so new mail stops arriving until you turn it back on. Go to Settings → Accounts → your Google account and confirm Gmail sync is on, then check Inbox categories inside the Gmail app itself, since both switches control this independently.
Will removing and re-adding my Gmail account delete my emails?
No — your emails live on Google's servers, not on your device. Removing the account only clears the local copy your device syncs, and everything reappears once you sign back in.
Why does Gmail sync fine on WiFi but not on mobile data, or the other way around?
This usually points to a network-specific issue rather than a Gmail problem — a restrictive WiFi network (common on public or work WiFi) or a mobile data restriction on the Gmail app specifically. Check your phone's data usage settings to confirm Gmail has permission to use mobile data if that's the pattern you're seeing.
How long should I wait before trying another fix?
Give each change a few minutes before moving to the next step — some fixes, like toggling account sync or reconnecting to WiFi, take a moment to actually take effect rather than working instantly.