Many Users having confusion about how to Unlock, if some done wrong can Kill the Phone, keeping in mind i have tried to make Procedure easier step by step.
1st. How to Flash: (Step I, II & III) can be seen in
Image 1
Step I- Extract "RM-803_Qualcomm_DLOAD.z" to Product directory "Phoenix\Products\RM-803"
Step II- Choose "Nokia 710 RM-803 Qualcomm DLOAD" on market item.
Step III- Flash.
IMAGE 1 
2nd. How to Unlock after Flashing, changing phone mode to "OSBL" , all Steps below can be seen in
Image 2.
Install drivers for "Qualcomm CDMA Technologies MSM" with driver from directory "data\drivers\qcusb"
You will see "Phone detected in "Qualcomm DLOAD" mode, if not seen Click Interface Scan button.
Now you will see "Phone detected in "Qualcomm DLOAD" mode, please use eMMC Tool !" and eMMC Tool show up
Click "Disk Info"
IMAGE 2 
NOTE: a Mass storage device( Qualcomm MMC Storage USB Device )
will be detected by Windows
and will ask if you want to format,
DO NOT ATTEMPT TO FORMAT, click
"Cancel" 3rd. Now Final Step for Unlocking given below can be seen in
Image 3
Click
"Unlock"
Caution: Don't Click any other Button while doing Unlock Process, if have no Idea for what function they works.
IMAGE 3 
Note: If ask for Network Code after Unlock, just put
00000000 (8 times 0 Digit)
Now Lumia Phone is Unlocked easily.
Don't you think it's easy to Unlock?
For me it is.....
Best Regards,
Zuber Chowdhry
