I'm trying to get the new Bluetooth Channel Sounding distance measurement working between an iPhone 17 running iOS 27 Beta4 and a Nordic nRF54L15DK board. I enabled bonding in the latest ipt_reflector sample from Nordic. Someone get the sample working with iOS 27 beta1. I paired the board with AccessorySetupKit. I suspect that the Channel Sounding feature is subject to regional restrictions by country (China). Here's the code to check if CS is available on my iPhone func centralManagerDidUpdateState(_ central: CBCentralManager) { switch central.state { case .poweredOn: print("central update") if CBCentralManager.supports(.channelSounding) { print("Supports channel sounding - YES") } else { print("Supports channel sounding - NO") } if let id = pendingPeripheralIdentifier, let name = pendingPeripheralName { pendingPeripheralIdentifier = nil pendingPeripheralName = nil retrieveAndConnect(identifier: id, name: name) } case .poweredOff: connectionState = .bluetoothOff case .unauthorized: connectionState = .error("Bluetooth not authorized — check Settings") case .unsupported: connectionState = .error("BLE not supported on this device") default: break } } The console log shows [ASK] Session activated — accessories: 1 central update Supports channel sounding - NO [CS] startChannelSounding skipped — channelSounding not supported Please also check the topic. it's very similar.