If you are travelling, buy a local SIM card and save on roaming fees, you need to unlock your phone.
In order to unlock your Lenovo K800 , you must have your IMEI number and a microSIM card from another service provider.
If you want to unlock your Lenovo K800 for free,Follow these steps:
Dial 8#06# and the Lenovo K800 IMEI code will appear on screen then record your IMEI number on paper.
Call your service provider’s customer service line and ask customer service for the SIM unlock code for your Lenovo K800.
Once you receive your SIM unlock code from your service provider, turn off your Lenovo K800
Remove the microSIM card from the phone
Insert a microSIM card from another service provider and turn the Lenovo K800 back on
When prompted, enter the SIM unlock code sent to you by your service provider
Enjoy your Lenovo K800 on any GSM carrier of your choice.
Of course, if you can not get IMEI number from the customer service,you can go to http://www.htcsimunlock.com/#oid=1141_1 for help.
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