Does the AGPS service on Android devices have a centralized system?

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Yes, the AGPS service on Android devices typically relies on a centralized system to provide assistance data, such as satellite ephemeris and almanac information, to improve GPS performance. This assistance data is typically obtained from mobile network operators or other third-party providers and is delivered to the device via the internet or wireless network. However, some devices may also support locally stored assistance data, which can be obtained through GPS satellites or downloaded from the internet.