try this steps
Enter your 15 digit IMEI›››Before we can send your unlocking code we need you to do something for us first. Every phone has a code that is as unique as a fingerprint, it is called an IMEI number. To locate your unlocking code we need you to provide us with your IMEI number. (You can either locate your 15 digit IMEI number underneath your battery, usually on a label, or alternatively you can simply dial *#06# on your phone)
Unlocking code is requested for your IMEI›››Once we have received your payment we send a request for the
unlocking code for your Rogers Sony Ericsson K850i. Within 48-72 business hours (excluding weekends & holidays) of us receiving your payment we will send you your unlocking code with step-by-step instructions on how to enter it
Your Sony Ericsson K850i is instantly unlocked›››After entering the
IMEI unlock code, your phone is instantly unlocked and ready for use on any GSM Network. This is a permanent unlock and your device can never be locked again
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