My wifii router not detected to others device

Plug yr phone into the USB port on your Internet device.
Your phone will show up as an accessible device under My Computer. Then download and install to the phone drive.

Here is an article from Netgear that explains how to change your password.

http://kb.netgear.com/app/answers/detail/a_id/23438

yes it is okay to unplug routers when not in use. make sure to check the settings to make sure it does not reset on accident.

have you got two dhcp servers running ?
turn off dhcp server in wireless router
and use the one in the Thomson TWG850-4 Residential Voice Gateway.
make sure ip address in wireless router is different to the Thomson TWG850-4 Residential Voice Gateway. make it one higher on last digit of ip address
make sure dhcp does not lease out this ip address.

Check weather any other device can detect wifi signal of your modem router. If it cannot detect the signal then it may be the complaint of your modem roter wifi.
If the other device can detect wifi of your modem router then back up the data of your phone and reset it. It will work fine.
Thank you

probably wifii speed depends on how many people sharing it , measure your speed using http://www.ip-details.com/internet-speed-test/

there were some random wifi issues with ipads early on but the most recent updates through itunes have corrected those. So best thing would be to connect to your computer and make sure its updated. if that doesn't work, may be a range issue, they dont have the longest reception.

its the same password for the wireless account it wouldnt be on the router. when you installed the router to your computer you needed a password whatever you put in for the password its the same thing

If your using a router to get wireless from a DSL connection and your laptop isn't detecting the signal it is most commonly the wireless card in the computer, hence their response. If you can access the router to check what channel it is transmitting on you may be able to change that to resolve the issue. On my cisco router it transmitted on channel 6 by default and my laptops wouldn't detect it, I changed it to transmit on channel 5 and the laptops work fine. I assume they checked if your router was compatible with your computer so I won't go into the type G wireless vs Type B or N wireless. The uninstall/install process they recommended is not hard and shouldn't hurt anything if you do that. On Vista Open Control Panel->System->Device Manager then go down the list of devices to Network Devices and select your wireless adapter and right click, from that drop menu select uninstall and close everything and reboot the computer. When the computer starts up again it will automatically detect the wireless card and reinstall the drivers from the windows system copy. Make sure the wireless device is actually manually turned on before doing any of these steps. Once the device is installed again you should be able to detect the wireless signal from the router they supplied. If not there is one more place to look in the router itself unless you are familiar with router settings I don't recommend you do these though. If you still don't detect the router signal call your supplier back and have them go through the router connections with you and when they say it's your computer you can tell them it works fine with others and you removed and installed the device as they advised and the fault is in their router.

you want to put a password on wpa security...
here's what you do, actually you are going to open the firmware of your Wireless Router.
Open Internet Explorer, at the "search engine" just type the Gateway Address (192.168.x.x) then ENTER. After that will asking for Login: admin Password: admin __ this time your on the firmware of the Router. This time will appear and select for putting a password on wpa security. Hope this might you the steps. Good luck!