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Returns all observed cell information from all radios on the device including the primary and neighboring cells. This does not cause or change the rate of PhoneStateListner#onCellInfoChanged.
The list can include one or more of Android.Telephony.CellInfoGsm, Android.Telephony.CellInfoCdma, Android.Telephony.CellInfoLte and Android.Telephony.CellInfoWcdma in any combination. Specifically on devices with multiple radios it is typical to see instances of one or more of any these in the list. In addition 0, 1 or more CellInfo objects may return isRegistered() true.
This is preferred over using getCellLocation although for older devices this may return null in which case getCellLocation should be called.