My device can connect WLAN and do well in office. But when i'm at home, it can not search the signal of WLAN. And all other mobile devices can connect WLAN and do well at home.
Why? Which configuration i set is wrong?

https://bugs.maemo.org/show_bug.cgi?id=2082

@girlmail2005:

The bug thread linked by Ima is informative, but the early part of it can be discouraging. You might get the impression that there is no solution to this problem. In case you didn't follow the thread as far as Comment 17, I would like to draw your attention to that comment and to later comments discussing the same technique, specifically Comments 19, 22, 26 and 27.

Many people find that they can connect the 770 quite easily with that technique. Success or failure is partly a matter of acquiring the knack, but it might also depend on the model of your router/AP. [EDIT: Originally I had written about difficulties I experienced trying to connect with an Asus router. It turns out that I had configured the connection wrongly in the 770. There was nothing wrong with the body-shielding technique.]

2.4 GHz signals of any kind can interfere with the search and association processes. After initial success with one router, I moved it into a different position, and then could no longer connect the 770. (I could not connect my N800 either!) Eventually I traced the problem to a wireless-mouse dongle plugged into a netbook near the router. After unplugging the dongle, there were no more problems.

You might not even need to use the "body-shielding" technique. I would ask you rwo questions:

1. Does your home router use n-type signals, or b/g only?
2. During network searches, do your other devices find your neighbors' networks, or just your own?

If you have an n-type router, the first thing to do is to turn off the n signal and only use b/g. That might solve your problem, unless you are receiving a lot of signals from other routers in the neighborhood. If you still can not connect the 770, the next step is to try the body-shielding technique.

The bug thread also contains suggestions for command-line solutions, in Comments 39 and 53. I strongly warn you against following Comment 53. You will make your 770 unbootable and you will have to reflash the firmware, unless your version of wireless-tools includes the iwpriv commands cited in that comment. Those commands are not included in the wireless-tools packages from the Maemo Gregale, Maemo Bora or Mulliner Mistral repositories. They are not even included in the 29-1 version from the Maemo Diablo repository.

Comment 39 is OK, but it is unnecessarily complicated, unless you actually do use a static IP configuration. If you use DHCP like nearly everyone else, a udhcpc command will do the configuration for you. I am planning to write a separate post on command-line connection. [EDIT: Done. See http://talk.maemo.org/showthread.php?t=85030 .] It is a useful option for anyone who has no success with the body-shielding technique. It will even enable you to connect with a b/g/n router.

The workaround I am using to connect to WLAN at home (usually when there are routers with n-type signals around) is in the following post:

http://talk.maemo.org/showpost.php?p...6&postcount=46

The 770 doesn't work with Wireless N routers. If you have a router before N, like a A, B, or G router, and can't connect, use the method from the link ima posted.