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Expecting your PC (having no inbuilt/internally installed WiFi adapter) to pick up tethering/hotspot WiFi signal (from your phone) without a WiFi adapter attached/connected into your PC's USB port is the same as expecting your PC's low battery to charge to full capacity when the power cable is not connected to the power supply point.
Get WiFi adapter connected to your PC first and then attempt to connect to your phone's wifi tether/hotspot
If your blue tooth is Usb type try to remove and replug it again,then you will observed that there is a blue tooth icon appear to the lower right corner of your computer, it means your connected or check it out to MY computer,look for the blue tooth icon. Right click the icon then choose what connection you want.
Theencryption key secures your data from unauthorized access.
The router's password is a Passphrase or the WEP or WPA orWPA2 encryption key.
The Passphrase generates the WEP or WPA or WPA2 encryptionkey and this is in the router's wireless settings.
To connect to your wireless router, configure the router'swireless settings ie SSID, plus the WPAor WPA2 encryption key and then configure wireless cards in the laptops and orcomputers with these router's wireless settings. Then the laptops and desktopcomputers can communicate with your wireless router.
A few things to try if havent all ready.
Make sure your other wifi devices can connect to internet in this network.
Toggle airplane mode 15 seconds.
go to Settings -> General -> Reset -> Reset All Settings.
In wifi settings join other network and manually enter SSID and wpa2 password, rather than trying to connect automatically. Turn ask to join networks off if you have to. Make sure the Wifi symbol is next to AT&T on top of phone. Open safari. If you are able to connect to router but not internet in safari. Check your Dns settings on iphone, if iphone is not resolving dns, make sure your router is configured properly.