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Why are incoming messages sometimes delayed or only arrive once I open the app?

If these symptoms occur, either push notifications aren’t working properly, or there is a problem concerning background activity. In other words, mobile devices (especially Android devices) restrict the app activity in the background after a while. Please follow the troubleshooting instructions for Android (Samsung, Huawei, Xiaomi, Sony, OnePlus, Gigaset, Ulefone Armor, Doogee, etc.) or iOS.

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