The problem with nexus s is that the current update for I9023 is 2.3.4 which sadly doesn't allow user to have access to a setting called regulatory domain
Now what this setting does is that it gives access to the all 14 channel and thus it allows you to connect to networks which are on channel above 11 which is mainly the case in Europe.
There are ways of changing the settings to allow channels upto 14 or just connect to your network manually.
source.
2nd method
1. Navigate to build.prop (usually in system) using root explorer.
2. Don't forget to change the file type from readonly to Read/Write on top of root explorer.
3. Change "ro.product.locale.region=US" to "ro.product.locale.region=EU" without semi colons.
4. Don't forget to save, then change the type to read only and then save and exit.
5. Reboot and enjoy
3rd method
Last but not least. Obtain the latest CM7 rom, flash it and navigate to wireless settigs -> Advanced -> Regulatory Domain -> 14
Hope it helps !
Now what this setting does is that it gives access to the all 14 channel and thus it allows you to connect to networks which are on channel above 11 which is mainly the case in Europe.
There are ways of changing the settings to allow channels upto 14 or just connect to your network manually.
My Nexus S still cannot access WiFi Channels 12 and 13.
The work around is to login to your WiFi Access point and manually over-ride the channel.
To do this, the procedure depends on your device, but the first step is to redirect your browser to your router. Try these:
http://192.168.1.1/
http://192.168.0.1/
http://10.1.1.1/
The default login and password might be admin, password, or admin, admin123.
Then you want to go to the Wireless or WiFi menu and browse through the available settings until you find Channel: Auto and change it to 1-11. Best to choose a channel that is vacant, so download the WiFi Analyzer app from the Android Market first to see what channels are in use first.
source.
2nd method
1. Navigate to build.prop (usually in system) using root explorer.
2. Don't forget to change the file type from readonly to Read/Write on top of root explorer.
3. Change "ro.product.locale.region=US" to "ro.product.locale.region=EU" without semi colons.
4. Don't forget to save, then change the type to read only and then save and exit.
5. Reboot and enjoy
3rd method
Last but not least. Obtain the latest CM7 rom, flash it and navigate to wireless settigs -> Advanced -> Regulatory Domain -> 14
Hope it helps !