There are several types of apps that you use on your android phones on daily basis. There are few which are available free of costa and there are some which require you to make payment for using them. These are categorized as paid Android Phone Apps and free android phone apps. To different users these sever the same purpose but to the owners of the apps these serve the benefits differently.
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https://hubtechnews.org/weighing-the-advantages-and-disadvantages-of-various-android-applications/