There's a network key for my ZyXel P660HW-T1 modem when connecting through wireless, and i never set any network keys before, what could be the probleM?

There is a reset button on the back of the router. You have to press it in for about 10 seconds. (While the router is on) This will reset the router to default settings. You will lose all security, and your network will be "Open". You will then have to refer back to the guide in order to setup your network security, and create a new password.
Here is a link to the guide.
ftp://ftp.zyxel.com/P-660HW-T1/user_guide/P-660HW-T1_3.40.pdf

You will have to reset the router to factory settings. There is a small hole in the back, depress the microswitch with a paper clip when the power is on. The default password is 1234. Some of these devices are general, while others are hardwired to work with certain providers. So if, say, this 660 is branded with embarq it is unlikely that you can set the parameters to work with other providers.

I should mention that if you care about security you should not use WEP - a cracker can break an internet connected WEP device in minutes with the right toolset. The protocol has many problems that simply can't be fixed, period. Consider using WPA2 with WPA backcompatability, as allowed by the 660.

It could be caused by interference by other nearby networks/devices. Try changing the wireless channel.

You should set the security on your computer wifi card to wpa-psk and then type in the securitycode which is written in your Zyxel Router.
If this is not possible with your networkcard, change to wpa or wpa2 inside the Zyxel. And do the same procedure with your networkcard, when detected the Router.

You must be sure to what router you are trying to connect. I understand you have a ZyXel and a linksys. You must have 2 wireless networks. Your wireless network must be secured, so you just have to use the correct password. I need more details. Try this http://technicalsupport.blog.friendster.com

did you setup a wireless network ? if you didnt go to control panal and then wireless network setup icon and follow instructions (select automatically provide network key option) then follow instructions and finish. once you did that, search through wifi on youf phone it should find your WNetwork and then connect and enjoy. if you want to use internet and have an ADSL modem, make sure that the modem is connected to the internet RJ45 plug on your router. and from router to PC.

good luck, i hope this helps

i had the same problem too with my'n. My issue was on of my setting's was set to block that wi-fi connection. Try switching your setting for finding internet connection from automatic to manual. that should do the trick!

ok do this if it is already showing your router up on your portable device but it has that security lock and you are unable to join or need a password which u dont know lol go to that network and on the top push forget this network. than go back and click on for other location. than for the name put in your router name usually 5 characters long make sure u use capitalization cuz its case sensitive. than select what kind of key u have it should say right on the side of your wireless router. than type the key in usually a wep key and u should be set to join it if it doesnt auto matically do soo

I forgot my modem wireless password...and I can not make a connection without cable...

Check in network settings that the two computers have not the same IP address.