Ashwin Lewis
It can be frustrating to wake up to a text from your mobile provider notifying you that you've run out of data, especially if your phone was on sleep mode all night. Several factors could be responsible for data usage while your phone sleeps. For instance, your phone might auto-download updates for apps, or it could be that your carrier updates its system and sends out a message at midnight. To prevent unnecessary data usage, you can turn off mobile data or put your phone on airplane mode at night. Alternatively, you can set up an automation to turn off mobile data whenever your phone is in Do Not Disturb mode.
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What You'll Learn
A phone may use data in sleep mode if it's not plugged in and charging
This can be a problem for those without unlimited data plans, as data usage can quickly add up. In some cases, phones have been observed to use up to 100 MB of data a month while sleeping, which can be excessive and unexpected.
There are several reasons why a phone may be using data while in sleep mode. One reason could be that the phone is auto-downloading updates for apps, which can be turned off in the settings. Additionally, some phones may disconnect from Wi-Fi when in sleep mode or when the screen is locked, which causes the phone to revert to using cellular data. This can be prevented by turning off Wi-Fi Assist in the settings, which uses mobile data when the Wi-Fi connection is poor or limited.
To prevent data usage while sleeping, some users suggest turning off the phone or turning off mobile data during those hours. Another suggestion is to set up an automation that turns off mobile data during specific hours, such as when the phone is in Do Not Disturb mode. This can help save mobile data and prevent unexpected usage.
It is important to note that closing apps from the recents tray usually does not affect data usage, and it is more effective to turn off background app refresh in the settings. By being mindful of these settings and making the necessary adjustments, users can minimize data usage while their phones are in sleep mode and not plugged in.
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Data usage may be due to auto-downloaded updates for apps
When your phone is asleep, it can still use data if certain settings are enabled. One such setting is automatic app updates, which can consume data even when the phone is asleep. This is because some apps are configured to auto-download updates in the background, using a limited portion of your monthly mobile data.
Google Play, for example, can automatically update your apps, and while it prioritises doing so over Wi-Fi, it can also use mobile data. The amount of mobile data used depends on various factors, such as previous usage patterns. If you have updated apps manually over mobile data in the past 30 days, Google Play may use that amount as a budget for future auto-updates.
Similarly, the App Store on iOS devices restricts automatic downloads over cellular connections based on app size. However, the Play Store on Android devices does not have this restriction, and it will auto-update apps using mobile data if the setting is enabled.
To prevent unnecessary data usage, you can disable automatic updates for specific apps or turn off auto-updates entirely. On Android devices, go to the Play Store, click on your profile icon, select 'Settings', expand 'Network preferences', and choose 'Over Wi-fi only' under 'Auto-update apps'. For iOS devices, go to 'Settings', select 'General', and turn off 'Background App Refresh'.
By managing these settings, you can reduce data usage caused by auto-downloaded updates for apps, even when your phone is asleep.
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Wi-Fi may be disconnected when a phone enters sleep mode
When a phone enters sleep mode, it may disconnect from Wi-Fi, resulting in a switch to cellular data usage. This behaviour has been observed on various devices, including Samsung Galaxy S2, Lenovo A5000 and P70, and iPhones. In some cases, the Wi-Fi connection may only be interrupted when the phone is not plugged into a power source.
For Android users, there are settings available to control Wi-Fi behaviour during sleep mode. On Android 2.3 and earlier, users can navigate to Menu > Settings > Wireless & Networks > Wi-Fi Settings, select the menu button, choose 'Advanced', and then set the 'Wi-Fi Sleep Policy' to 'Never'. On Android 4.0 and later, the path is Menu > Settings > Wi-Fi. After selecting the menu button, choosing 'Options', and then 'Advanced', users can set 'Keep Wi-Fi on during sleep' to 'Always'.
IPhone users have also reported issues with Wi-Fi disconnection during sleep mode, particularly after updates. While there is no universal setting to keep Wi-Fi active during sleep mode on iPhones, ensuring that the device is connected to an external power source may help maintain the Wi-Fi connection.
It is worth noting that keeping Wi-Fi active during sleep mode may impact battery life. Additionally, some background apps may continue to use cellular data even when Wi-Fi is connected, resulting in unexpected data charges. To mitigate this, users can disable background app refresh or turn off cellular data for specific apps in their phone settings.
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Some apps use more data than others, e.g. games
When your phone is asleep, it may still use some data, depending on your settings. For example, if your phone is set to auto-download updates, then it may use data to do so while asleep. Similarly, if your phone is not plugged in and reverts to using cellular data when the screen goes to sleep, you may find that your phone uses data while you are asleep.
To prevent this, you can turn off background app refresh in your settings. You can also turn off your phone's ability to fall back on cellular data when WiFi is unavailable. Alternatively, you can set up an automation that turns off mobile data when your phone is in Do Not Disturb mode, which is likely preferable to turning on flight mode, as you will still be able to access WiFi.
Some apps use more data than others, and gaming apps are a prime example. A study by Surfshark found that the average hunger index (the amount of data collected) of 510 apps was 26.9, while the average for the top 10 games was 32.6, 21.2% higher. Games that collect the most data include Scrabble GO, Tarbi3ah Baloot, Call of Duty: Mobile, and Candy Crush Soda Saga. Mobile games tend to consume less data than console or PC games due to simpler graphics and smaller game sizes. For example, Candy Crush Saga uses around 1-5 MB of data per hour. Even more data-intensive mobile games, such as Genshin Impact, tend to cap at around 150 MB per hour. However, lowering the graphics quality and limiting the frame rate can help reduce data usage during online play.
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Data usage notifications may not always be accurate
Secondly, certain apps may continue to run in the background and use data even when the phone is asleep. This includes apps that auto-download updates or have background refresh settings enabled. These background data usages can be difficult to track and may not be accurately reflected in data usage notifications.
Additionally, push notifications have been known to use up cellular data, even when the phone is connected to Wi-Fi. This issue has been specifically reported by iPhone users, who have noticed a significant increase in cellular data usage due to push notifications. Resetting network settings or reinstalling iOS has helped some users reduce this issue, but it hasn't completely eliminated it.
Furthermore, data usage notifications may not account for data used by system updates or carrier updates, which can occur automatically in the background. These updates can use a significant amount of data, and the timing of the updates may not align with the data usage notification period, leading to unexpected data usage.
To better manage data usage and improve the accuracy of notifications, users can take several steps. These include disabling background app refresh, turning off automatic updates, and setting data limits or warnings within the phone's settings. Users can also monitor which apps are using the most data and adjust their settings accordingly. By taking these proactive measures, users can gain better control over their data usage and improve the accuracy of their data usage notifications.
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Frequently asked questions
Yes, your phone may use a small amount of data while it's asleep. This is because it's still receiving notifications, which are usually received on a cellular network. If you have Wi-Fi turned on, your phone will switch to Wi-Fi if the notification requires data, such as with emails.
Your phone uses data to sync your apps and receive updates. If you have auto-updates turned on, your phone may download updates while it's asleep, using more data. Additionally, some apps may access the internet in the background, even when not in use.
To completely prevent data usage, you can turn your phone off while you sleep. Alternatively, you can turn off mobile data before going to sleep. This will ensure that your phone only uses Wi-Fi when it needs to access the internet.
Some carriers, such as Verizon, bill cellular data in blocks. This means that data usage may be recorded in blocks rather than in real-time, resulting in data usage being attributed to times when your phone was asleep. Additionally, Wi-Fi may be intentionally powered off when your phone is in sleep mode to conserve battery, causing your phone to use cellular data instead.
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