[Sony Xperia P, U, Sola, Go] ruifung:
I tried to tether my phone to a iPhone 5 over bluetooth, but for some reason it disconnects seconds after connecting.

Logcat:

D/BluetoothPanProfileHandler( 3124): connect PAN(/org/bluez/5452/hci0/dev_38_48_4C_22_B9_29)

D/BluetoothPanProfileHandler( 3124): Pan Device state : device: 38:48:4C:22:B9:29 State:0->1

D/BluetoothService( 3124): CONNECTION_STATE_CHANGE: 38:48:4C:22:B9:29: 0 -> 1

E/BluetoothService.cpp( 3124): connectPanDeviceNative

D/BluetoothPanProfileHandler( 3124): connecting to PAN

D/CachedBluetoothDevice(10503): Command sent successfully:CONNECT Address:38:48:4C:22:B9:29 Profile:PAN

V/BluetoothEventManager(10503): Received android.bluetooth.pan.profile.action.CONNECTION_STATE_CHANGED

D/CachedBluetoothDevice(10503): onProfileStateChanged: profile PAN newProfileState 1

D/BluetoothEventLoop( 3124): Device property changed: 38:48:4C:22:B9:29 property: Connected value: true

D/BluetoothEventLoop( 3124): onPanDeviceConnectionResult /org/bluez/5452/hci0/dev_38_48_4C_22_B9_29 1004

D/Tethering( 3124): sendTetherStateChangedBroadcast 1, 0, 0

D/BluetoothPanProfileHandler( 3124): Pan Device state : device: 38:48:4C:22:B9:29 State:1->2

D/BluetoothService( 3124): CONNECTION_STATE_CHANGE: 38:48:4C:22:B9:29: 1 -> 2

D/Tethering( 3124): InitialState.processMessage what=4

V/BluetoothEventManager(10503): Received android.bluetooth.pan.profile.action.CONNECTION_STATE_CHANGED

D/CachedBluetoothDevice(10503): onProfileStateChanged: profile PAN newProfileState 2

D/Tethering( 3124): sendTetherStateChangedBroadcast 0, 0, 0

D/Tethering( 3124): sendTetherStateChangedBroadcast 1, 0, 0

I/ActivityManager( 3124): Start proc com.sonyericsson.tetherentitlementcheck for broadcast com.sonyericsson.tetherentitlementcheck/.TetheringMobileStateReceiver: pid=11614 uid=10099 gids={}

W/NetworkStats( 3124): dropping UID delta from unknown iface: iface=bnep0 uid=0 set=DEFAULT tag=0x0 rxBytes=0 rxPackets=0 txBytes=76 txPackets=1 operations=0

I//system/bin/dhcpcd(11625): dhcpcd[11626]: version 5.2.10 starting

I/ActivityManager( 3124): Process com.google.android.apps.plus (pid 11482) has died.

I//system/bin/dhcpcd(11625): dhcpcd[11626]: host does not support a monotonic clock - timing can skew

I//system/bin/dhcpcd(11625): dhcpcd[11626]: bnep0: rebinding lease of 172.20.10.2

I/ActivityManager( 3124): Process com.sonyericsson.lockscreen.uxpnxt (pid 11526) has died.

W/Netd (24456): No subsystem found in netlink event

D/NetlinkEvent(24456): Unexpected netlink message. type=0x11

I//system/bin/dhcpcd(11625): dhcpcd[11626]: bnep0: carrier_status: No such device

I//system/bin/dhcpcd(11625): dhcpcd[11626]: bnep0: removing interface

D/Tethering( 3124): InitialState.processMessage what=4

D/Tethering( 3124): sendTetherStateChangedBroadcast 0, 0, 0

W/NetworkStats( 3124): dropping UID delta from unknown iface: iface=bnep0 uid=0 set=DEFAULT tag=0x0 rxBytes=0 rxPackets=0 txBytes=120 txPackets=2 operations=0

D/BluetoothPanProfileHandler( 3124): Pan Device state : device: 38:48:4C:22:B9:29 State:2->0

D/BluetoothAdapterStateMachine( 3124): BluetoothOn process message: 52

D/BluetoothService( 3124): CONNECTION_STATE_CHANGE: 38:48:4C:22:B9:29: 2 -> 0

D/BluetoothEventLoop( 3124): Device property changed: 38:48:4C:22:B9:29 property: Connected value: false

V/BluetoothEventManager(10503): Received android.bluetooth.pan.profile.action.CONNECTION_STATE_CHANGED

D/ConnectivityService( 3124): ConnectivityChange for BLUETOOTH_TETHER: DISCONNECTED/DISCONNECTED

D/ConnectivityService( 3124): Attempting to switch to mobile

D/ConnectivityService( 3124): Attempting to switch to WIFI

D/CachedBluetoothDevice(10503): onProfileStateChanged: profile PAN newProfileState 0

E/BluetoothTethering( 3124): DHCP request error:DHCP result was failed