i unlocked and JB my iphone 3g upgraded OS to 4.2.1. Everything went just fine. The phone cannot connect to wifi. The mac address shows up fine. Its not showing the wireless connections that are available. Please help.

thats how its gonna stay until someone decides to fix it, I did the same thing and everyone who did have to suffer the consequences as far as I know this is a hardware problem I'm not sure whether or not its possible to get wifi to start working again but I hope its possible, but then again anything is possible someone just needs to work on it.

see this thread
http://www.hackint0sh.org/f148/193281.htm

Originally Posted by naras

i unlocked and JB my iphone 3g upgraded OS to 4.2.1. Everything went just fine. The phone cannot connect to wifi. The mac address shows up fine. Its not showing the wireless connections that are available. Please help.

What baseband? As I keep on saying in other threads about wifi - a syslog of the iPhone startup helps a lot with diagnosis.

That you can see mac address rules out some causes.

Hello, I have same problem at 3G BB 06.15.00 and iOS 4.1/4.2.1. I've turn on verbose boot and see wifi mac address at syslog when device starts.

Originally Posted by zl0y

Hello, I have same problem at 3G BB 06.15.00 and iOS 4.1/4.2.1. I've turn on verbose boot and see wifi mac address at syslog when device starts.

Can you publish on pastebin.com a copy of your syslog?

How I can copy syslog output to file?

Syslog sbsettings toggle. This writes to a file - location

/var/log/syslog

He is it: Dec 23 14:08:48 localhost /usr/libexec/misd[28]: p

Also I have try to WIFI ON/OFF syslog messages:

Dec 23 14:25:27 Veritas SpringBoard[27]: MultitouchHID(20eb90) uilock state: 1 -> 0
Dec 23 14:25:27 Veritas SpringBoard[27]: MultitouchHID(28c300) device bootloaded
Dec 23 14:25:31 Veritas Preferences[126]: MS:Notice: Installing: com.apple.Preferences [Preferences] (550.38)
Dec 23 14:25:32 Veritas Preferences[126]: MS:Notice: Loading: /Library/MobileSubstrate/DynamicLibraries/Activator.dylib
Dec 23 14:25:32 Veritas Preferences[126]: MS:Notice: Loading: /Library/MobileSubstrate/DynamicLibraries/PreferenceLoader.dylib
Dec 23 14:25:36 Veritas configd[25]: CaptiveNetworkSupport:UIAllowedNotifyCallback:70 uiallowed: true
Dec 23 14:25:36 Veritas profiled[128]: profiled|Service starting...
Dec 23 14:25:36 Veritas Preferences[126]: _dynamicStoreKeys: (\n "State:/Network/Service/3CE9AD65-A37A-459D-8064-3357609FD63F/DNS",\n "State:/Network/Service/3CE9AD65-A37A-459D-8064-3357609FD63F/IPv4",\n "Setup:/Network/Service/3CE9AD65-A37A-459D-8064-3357609FD63F/DNS",\n "Setup:/Network/Service/3CE9AD65-A37A-459D-8064-3357609FD63F/IPv4",\n "Setup:/Network/Service/3CE9AD65-A37A-459D-8064-3357609FD63F/Proxies",\n "Setup:/Network/Global/IPv4"\n)
Dec 23 14:25:39 Veritas Preferences[126]: -[WiFiManager setEnabled:]2010-12-23 12:25:39 GMT) Requested wifi power change to OFF
Dec 23 14:25:39 Veritas Preferences[126]: -[WiFiManager(Private) _powerChanged]2010-12-23 12:25:39 GMT) power changed calback, power is now: OFF
Dec 23 14:25:40 Veritas kernel[0]: AppleMRVL868x::setPOWER() [configd]: 0
Dec 23 14:25:40 Veritas kernel[0]: AppleMRVL868x::getSCAN_RESULT(): WiFi not powered on (0x3)
Dec 23 14:25:40 Veritas kernel[0]: AppleMRVL868x::setPOWER(): Flushing beacons!!
Dec 23 14:25:40 Veritas Preferences[126]: -[WiFiManager setEnabled:]2010-12-23 12:25:40 GMT) Requested wifi power change to ON
Dec 23 14:25:40 Veritas Preferences[126]: -[WiFiManager(Private) _powerChanged]2010-12-23 12:25:40 GMT) power changed calback, power is now: ON
Dec 23 14:25:41 Veritas kernel[0]: AppleMRVL868x::setPOWER() [configd]: 1
Dec 23 14:25:42 Veritas Preferences[126]: -[WiFiManager setEnabled:]2010-12-23 12:25:42 GMT) Requested wifi power change to OFF
Dec 23 14:25:42 Veritas Preferences[126]: -[WiFiManager(Private) _powerChanged]2010-12-23 12:25:42 GMT) power changed calback, power is now: OFF
Dec 23 14:25:43 Veritas kernel[0]: AppleMRVL868x::setPOWER() [configd]: 0
Dec 23 14:25:43 Veritas kernel[0]: AppleMRVL868x::getSCAN_RESULT(): WiFi not powered on (0x3)
Dec 23 14:25:43 Veritas kernel[0]: AppleMRVL868x::setPOWER(): Flushing beacons!!
Dec 23 14:25:43 Veritas Preferences[126]: -[WiFiManager setEnabled:]2010-12-23 12:25:43 GMT) Requested wifi power change to ON
Dec 23 14:25:43 Veritas Preferences[126]: -[WiFiManager(Private) _powerChanged]2010-12-23 12:25:43 GMT) power changed calback, power is now: ON
Dec 23 14:25:44 Veritas kernel[0]: AppleMRVL868x::setPOWER() [configd]: 1

I don't see any known hardware problem in that syslog.

Have you got OpenSSH installed?