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How you can know if your smart phone has two system
If your smartphone has two systems, it might be using a technology called "dual boot" or have a feature like "dual SIM." Dual boot means it can run two different operating systems, like Android and another OS, while dual SIM allows you to use two separate SIM cards at once for different purposes or carriers. To check if your phone has dual boot capabilities, look for options in the settings or do some research on your phone's model. For dual SIM functionality, check if your phone has two SIM card slots or explore the settings for dual SIM options.
2 ways are higher can make your iPhone not to eat more data
Wi-Fi Assist:Disable Wi-Fi Assist: This feature automatically switches to cellular data when the Wi-Fi connection is weak. Sometimes, it can consume more data unknowingly. You can turn it off by going to Settings > Cellular and scrolling down to disable Wi-Fi Assist.2. Manage App Data Usage:Limit Background App Refresh: Restrict certain apps from using data in the background. Go to Settings > General > Background App Refresh and either turn it off entirely or select specific apps to refresh only when connected to Wi-Fi.Control App Data Usage: Some apps use a lot of data for things like automatic updates, video autoplay, or syncing in the background. You can manage these individually by going to Settings > Cellular, then scroll down to see which apps are using the most data. From there, you can toggle off cellular access for specific apps.