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If you want to unlock your Sony Ericsson 810i mobile phone from the network lock,you can get network unlock code from Theunlockarena.com at reasonable price.Here theyask you to specify the country name,current network provider and IMEI number of your mobile phone.
To listen to music on the Walkman 810i with a Bluetooth headset, it must first be paired with the headset. Go to the settings Menu and select Bluetooth and follow the instructions to pair it with the headset. The phone also needs to have music downloaded to it from the Internet as it does not store music unless it has been downloaded first.