Privacy Cell

https://developer.android.com/reference/android/telephony/ServiceState#getCellBandwidths()

https://developer.android.com/reference/android/telephony/ServiceState#getChannelNumber()

https://developer.android.com/reference/android/telephony/ServiceState#getDuplexMode()

https://developer.android.com/reference/android/telephony/ServiceState#getRoaming()

https://developer.android.com/reference/android/telephony/ServiceState#getOperatorAlphaShort()

https://developer.android.com/reference/android/telephony/ServiceState#getOperatorAlphaLong()

https://developer.android.com/reference/kotlin/android/telephony/TelephonyCallback.PhysicalChannelConfigListener

https://developer.android.com/reference/kotlin/android/telephony/PhysicalChannelConfig

https://android.googlesource.com/platform/frameworks/base/+/master/telephony/java/android/telephony/AccessNetworkConstants.java

This information is currently restricted in Android:

https://issuetracker.google.com/issues/182811458

https://issuetracker.google.com/issues/188565322

Hopefully in a future release it becomes available to general apps.