> ## Content Index > Fetch the complete content index at: https://blog.harshkohli.com/llms.txt > Use this file to discover other available public pages before exploring further. # One UI 9 Wi-Fi or Mobile Data Dropping? Galaxy Fixes - URL: https://blog.harshkohli.com/one-ui-9-wifi-mobile-data-dropping-fix/ - Published: 2026-11-10T09:39:39.000Z - Updated: 2026-11-11T09:34:26.000Z - Description: Galaxy Wi-Fi or mobile data cutting out after One UI 9? Try these fixes, from Wi-Fi 7 Mode and network resets to APN and SIM checks. - Author: Harsh Kohli - Tags: Fixes, How-To, Phones *Updated: 10 November 2026\. Checked against Samsung's support pages on* [*resetting a Galaxy phone*](https://www.samsung.com/us/support/answer/ANS10002030/?ref=blog.harshkohli.com)*,* [*Wi-Fi Calling not working*](https://www.samsung.com/us/support/troubleshoot/TSG10004906/?ref=blog.harshkohli.com) *and* [*connection options*](https://www.samsung.com/us/support/answer/ANS10002546/?ref=blog.harshkohli.com)*, plus reporting from* [*Android Authority*](https://www.androidauthority.com/one-ui-9-wi-fi-mobile-data-sim-issues-galaxy-users-3731894/?ref=blog.harshkohli.com)*,* [*Android Police*](https://www.androidpolice.com/one-ui-9-leaving-some-galaxy-phones-struggling-stay-connected/?ref=blog.harshkohli.com)*,* [*TechRepublic*](https://www.techrepublic.com/article/news-samsung-one-ui-9-connectivity-issues/?ref=blog.harshkohli.com) *and* [*BGR*](https://www.bgr.com/2310418/one-ui-9-update-causing-wifi-issues-samsung/?ref=blog.harshkohli.com)*, and owner threads on the Samsung Community forums.* Short answer: if your Galaxy's Wi-Fi or mobile data started cutting out after the One UI 9 update, restart the phone, forget and rejoin the network, and then turn off **Wi-Fi 7 Mode** under Developer options if your phone has it. If that doesn't help, run **Reset Wi-Fi and Bluetooth settings** or **Reset mobile network settings**, put the APN back to default, and file an error report in Samsung Members. As of 10 November, Samsung hasn't confirmed a cause or a patch, so some of these are stopgaps rather than cures. I'll be upfront: I don't have an affected Galaxy here, so nothing below comes from my own testing. I've pulled it together from Samsung's own support pages, the tech sites that have been tracking the reports since 5 November, and the forum threads where owners say what helped and what didn't. Where a step only worked for some people, I'll tell you that too. **Jump to:** - [What's actually going wrong](#whats-actually-going-wrong) - [Step 1: Restart and check for an update](#step-1-restart-and-check-for-an-update) - [Step 2: Forget the network and try Phone MAC](#step-2-forget-the-network-and-try-phone-mac) - [Step 3: Turn off Intelligent Wi-Fi switching](#step-3-turn-off-intelligent-wi-fi-switching) - [Step 4: Turn off Wi-Fi 7 Mode](#step-4-turn-off-wi-fi-7-mode) - [Step 5: Reset Wi-Fi, Bluetooth and mobile network settings](#step-5-reset-wi-fi-bluetooth-and-mobile-network-settings) - [Step 6: Mobile data dead? Reset the APN and reseat the SIM](#step-6-mobile-data-dead-reset-the-apn-and-reseat-the-sim) - [Step 7: Try Safe Mode and split your router bands](#step-7-try-safe-mode-and-split-your-router-bands) - [Step 8: Report it to Samsung and your carrier](#step-8-report-it-to-samsung-and-your-carrier) - [Should you factory reset?](#should-you-factory-reset) - [FAQ](#faq) ## What's actually going wrong Samsung started pushing stable One UI 9, its Android 17 update, to the Galaxy S25 series in late September, and it has been spreading to older flagships, foldables and A-series phones since. Around the start of November the complaints started stacking up. Android Authority wrote it up on 5 November, and Android Police, TechRepublic and BGR followed. The annoying part is that "it broke my connection" covers a few different problems, and not every phone gets all of them. From what owners have posted, there are roughly five patterns: | What you see | Reported on | Start at | | ------------------------------------------------------------------------------------------------ | ----------------------------------------------- | ---------------- | | Wi-Fi works for a while, then drops with "Connection failed" and won't come back until a restart | Galaxy S24, S25 Ultra, A55, Z Fold 8 and others | Steps 1, 4 and 5 | | Only your home network fails; other saved networks are fine | Several owners in the forum threads | Steps 2 and 7 | | 2.4GHz works but 5GHz won't connect | Galaxy S24 Ultra | Steps 4 and 7 | | Mobile data won't load anything unless you're on Wi-Fi | Galaxy S24, S26 Ultra, S25, A16, A17 | Steps 5 and 6 | | Phone says "No SIM" or stops seeing one of two SIMs | Galaxy A56, A36, A52s, S24+ | Steps 6 and 8 | | Wi-Fi is fine but Wi-Fi Calling stopped working | Galaxy Z Fold 7 on T-Mobile | Step 8 | Since so many different models broke right after the same update, a software bug is the most likely explanation, and that's how Android Authority read it too. Restarting or toggling Airplane mode brings the connection back for a lot of people, but several say it drops again a couple of hours later. So if a restart "fixes" it, don't assume you're done. Before you start changing settings, do one quick check. Try the same Wi-Fi on a laptop or another phone, and try your Galaxy on a different network, like a friend's Wi-Fi or a hotspot. If everything drops on your router, the router or your internet provider is the more likely problem. If only the Galaxy drops, and it drops everywhere, it's the phone. ![Chart of One UI 9 settings paths on a Galaxy phone for MAC address type, Intelligent Wi-Fi, Wi-Fi 7 Mode, Reset Wi-Fi and Bluetooth settings, APN reset and Samsung Members error reports](https://blog.harshkohli.com/content/images/2026/11/one-ui-9-connection-settings-paths.webp) Where each setting in this guide lives. Chart: Harsh Kohli's blog, based on Samsung Support pages and owner reports. ## Step 1: Restart and check for an update Start with a proper restart, not just Airplane mode. Press and hold the side key (or pull down Quick settings and tap the power icon), tap **Restart**, and let it boot fully. It's a temporary fix for most people, but it tells you something: if a restart brings everything back and it fails again hours later, you're almost certainly looking at the One UI 9 bug, not a dead router. Then open **Settings > Software update > Download and install**. Samsung's November security patch is already landing on some models, and Android Police said it hoped the November firmware would address the connectivity problems. Samsung hasn't said it will, though, and I haven't found a changelog that mentions a Wi-Fi or data fix. Install whatever's offered anyway, then check again every few days. ## Step 2: Forget the network and try Phone MAC If it's only your home network acting up, rebuild that saved profile before you reset anything bigger: 1. Open **Settings > Connections > Wi-Fi**. 2. Tap the gear next to the network, then tap **Forget**. 3. Join it again and type the password. While you're in that network's settings, tap **View more** and look at **MAC address type**. Galaxy phones use a **Randomized MAC** by default, which is good for privacy. But if your router uses MAC filtering, IP reservations, parental controls or a mesh system that steers devices between bands, a big update can make the router treat your phone as a stranger. On your own home network, switching to **Phone MAC** is a fair test. I'd leave public Wi-Fi on randomized. ## Step 3: Turn off Intelligent Wi-Fi switching Samsung has a feature that jumps to mobile data whenever it decides your Wi-Fi is unstable. That's handy on a weak café network. It isn't so handy when a buggy update makes the phone think your perfectly good router is unstable. Go to **Settings > Connections > Wi-Fi**, tap **More options** (the three dots), then **Intelligent Wi-Fi**, and turn off **Switch to mobile data**. Samsung's support page says this setting moves you to mobile data when Wi-Fi gets unstable and back again when it improves. Turning it off won't fix a real dropout, but it does tell you whether the phone is choosing to leave Wi-Fi or actually losing it. You can switch it back on later. ## Step 4: Turn off Wi-Fi 7 Mode This is the closest thing to a real fix anyone has found so far. A Galaxy Z Flip 7 owner on Reddit said turning off Wi-Fi 7 Mode stopped the drops, and Android Authority passed the tip along. It doesn't work for everyone, and some owners say the option isn't there on their phone at all. That makes sense, since Wi-Fi 7 hardware is only in newer models. Still, if you have it, try it before the resets. 1. Turn on Developer options if you haven't already: go to **Settings > About phone > Software information** and tap **Build number** seven times, then enter your PIN. 2. Go back to **Settings** and open **Developer options** near the bottom. 3. Find **Connectivity Labs** and turn off **Wi-Fi 7 Mode**. 4. Restart the phone and rejoin your network. You lose Wi-Fi 7 speeds on a Wi-Fi 7 router, but the phone still works on Wi-Fi 6 and 6E, which is plenty for almost everything. If your router is Wi-Fi 7, turning off Multi-Link Operation (MLO) in the router's settings is another thing to try. It's the same idea from the other end. ## Step 5: Reset Wi-Fi, Bluetooth and mobile network settings One UI splits network resets into two, and you can use either or both. Both are under **Settings > General management > Reset**: - **Reset Wi-Fi and Bluetooth settings** wipes every saved Wi-Fi network and Bluetooth pairing. Use it for Wi-Fi drops. - **Reset mobile network settings** puts cellular settings back to default. Use it for mobile data, calling or texting problems. Tap the one you need, then **Reset settings**, and confirm. Neither one touches your apps, photos or messages. Samsung Canada's page warns that the Wi-Fi and Bluetooth reset happens the moment you tap, with no extra confirmation, so make sure you have your Wi-Fi password handy and know which earbuds and watches you'll need to pair again. Results here are mixed, and I'd rather tell you that than pretend otherwise. A Galaxy Z Fold 8 Ultra owner said doing both resets together fixed it outright. Others, especially people with dead mobile data, said a network reset changed nothing. It's still worth doing, because it's the one step that clears out any network settings the update may have mangled. ## Step 6: Mobile data dead? Reset the APN and reseat the SIM If Wi-Fi is fine but nothing loads on mobile data, the APN (Access Point Name, the profile your phone uses to reach your carrier's internet) is worth a look. Go to **Settings > Connections > Mobile networks > Access Point Names**, tap the three dots and choose **Reset to default**. If your carrier needs a custom APN, it lists the right values on its support site. Jio, Airtel, Vodafone Idea, T-Mobile, Verizon and AT&T all do. Samsung's own Wi-Fi Calling page notes you may need your carrier's help to re-enter APN details after a reset. While you're in **Mobile networks**, check **Network mode**. If it's set to a 5G option and data keeps dying, switching to the LTE/4G option for a day is a cheap test. If data comes back, it points at the 5G side of the modem and not your plan. For "No SIM": power the phone off, take the tray out, check the card for dust, and put it back. If you use an eSIM, look at **Settings > Connections > SIM manager** to make sure it's still switched on. Some owners got their signal back this way, and some didn't. If both SIMs vanish and Samsung's diagnostics can't see either one, which is what one Galaxy A56 owner described, stop fiddling and go to Step 8\. That's a job for Samsung or your carrier, not more resets. ## Step 7: Try Safe Mode and split your router bands A Samsung Community moderator suggested Safe Mode, which starts the phone with downloaded apps disabled. Press and hold the side key, then touch and hold **Power off** until **Safe mode** appears, and tap it. Use the phone for an hour or two. If the drops stop, a VPN, ad blocker, battery saver or "Wi-Fi booster" app is a likely suspect. Uninstall recent ones and restart normally. If you use Private DNS to block ads, set it to Off for a while too. I've covered how that setting works in my [Private DNS ad-blocking guide](https://blog.harshkohli.com/private-dns-android-block-ads/). On the router side, the 2.4GHz-works-but-5GHz-doesn't reports suggest something else to try. If your router broadcasts one name for both bands, split them into two (for example "Home" and "Home-5G") in its admin page, and connect the Galaxy to whichever one stays up. It's a workaround, not a fix, but it can get you through until Samsung patches it. A router firmware update is worth checking while you're in there. ## Step 8: Report it to Samsung and your carrier This one matters more than it sounds. Open **Samsung Members**, tap **Support**, then **Error reports**, and describe what's happening. Samsung recommends sending the report within five minutes of a failure and keeping the app open while it collects logs, so do it right after a drop, not the next morning. A report that says "Galaxy S24, One UI 9, Wi-Fi drops every 2 hours with Connection failed, Wi-Fi 7 Mode off didn't help" is far more useful than "Wi-Fi broken". For mobile data, SIM or Wi-Fi Calling problems, call your carrier too. It can check whether the problem is on its side, and a logged ticket helps if the fix turns out to need a network change. If Wi-Fi Calling is the only thing broken, open the Phone app, tap the three dots, go to **Settings**, and make sure **Wi-Fi calling** is still on. Toggle it off and back on. I've got a longer list in my [Wi-Fi Calling not working guide](https://blog.harshkohli.com/wifi-calling-not-working/). ## Should you factory reset? Not yet, in my opinion. A Samsung Community moderator did suggest it, but at least one owner said a full wipe didn't bring mobile data back, and that's exactly what you'd expect if the bug is in One UI 9 itself. You'd lose a day setting the phone up again and end up on the same software. I'd only consider it once Samsung ships a fix and the problem still sticks around afterwards. If you do go that way, back up first with Smart Switch or Samsung Cloud. And if your Galaxy is offering One UI 9 but you haven't installed it yet, and your phone works fine today, I'd wait a week or two. I'm not against updating. It's just that this time the update is the thing that seems to be breaking connections, so it makes sense to let Samsung patch it first. Pixel owners have had a similar run of Wi-Fi trouble on Android 17, which I went through in [this Pixel Wi-Fi guide](https://blog.harshkohli.com/pixel-wifi-keeps-dropping-android-17/), and an earlier One UI 9 bug got its own [XML access denied fix](https://blog.harshkohli.com/one-ui-9-xml-access-denied-fix/). **Related guides:** next stop is my guide to [Pixel lag after Android 17 QPR1](https://blog.harshkohli.com/pixel-lag-android-17-qpr1-fix/). After that, see [Bluetooth headphones that keep disconnecting](https://blog.harshkohli.com/bluetooth-headphones-keep-disconnecting/) and [sites that won't load because of Intel ICPS and IPv6](https://blog.harshkohli.com/some-sites-wont-load-intel-icps-ipv6/) if either matches what you're seeing. ## FAQ ### Why does my Samsung keep saying "Connection failed" on Wi-Fi after One UI 9? Owners started reporting it right after the One UI 9 update, on a wide range of Galaxy models. That points to a software bug, but Samsung hasn't confirmed a cause yet. Restarting fixes it for a while, while turning off Wi-Fi 7 Mode and resetting Wi-Fi and Bluetooth settings have helped some people for longer. ### Has Samsung fixed the One UI 9 Wi-Fi and mobile data problem? Not as of 10 November 2026\. Samsung hasn't commented publicly on the reports, and I haven't seen a firmware changelog that mentions a fix. Keep checking Settings > Software update, because the November security update is still rolling out. ### Will resetting network settings delete my data? No. Reset Wi-Fi and Bluetooth settings and Reset mobile network settings don't touch your apps, photos or messages. You'll lose saved Wi-Fi passwords and Bluetooth pairings, and you may need to re-enter a custom APN from your carrier. ### Where is Wi-Fi 7 Mode on a Galaxy phone? Owners report it under Settings > Developer options > Connectivity Labs, once Developer options is turned on. It only appears on Galaxy phones with Wi-Fi 7 hardware, so many models won't have it. ### Can I roll back from One UI 9 to One UI 8? Samsung doesn't offer an official way to downgrade, and the unofficial route of flashing firmware with a PC tool can wipe your phone and void the warranty. For most people, waiting for Samsung's patch is the safer choice.