These are the steps to unlock your R204, R207 etc.
1. Make sure that your R207 is fully charged.
2. Change the default SIM with another network provider SIM and plug to Windows PC using USB cable.
3. Let it install all the drivers and software which is required by R207 to run it properly.
4. Now, open the Internet Explorer and type in browser 192.168.0.1 or what ever is default IP address of your router.
5. Login to router dashboard. (Default username and password is admin. If not then check the router manual).
6. Search for NCK / Unlock / Password / SIM Lock option and put the correct 8 digit unlock code.
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7. Now reboot the Vodafone R 207 and it will show the another network provider SIM.
8. Create the new profile according to the new SIM card and connect to internet.