Why cant my phone find or connect to my home wifi?

NO PC stated at all , maker and model numbers, (hopeless )
no OS stated, is it windows, if yes which one of the many.
wifi:
are you at home or at starbucks trying for wifi.
are you near your home router or 100' feet away or worse via brick or concrete walls.

test the PC near your router, for functionality.
then if that fails, take your CELL smart phone and test wifi with that phone, turn on wifi , and 3/4G off.
this tells you what is wrong. doing that.
1: router bad. (or needs reset)
2: you are using the wrong credentials.
eg: SSID name, wrong encryption use WPA2, and passphrase.
do you know all that, if not wifi is going to be a problem.

last question, who owns your WIFI router, you or the cable or phone company? if not you , only they can help.

Try turning off airplane mode. Or it could be something with your service provider and you have to pay for that.

when we reset phone it usually turn the phone states into factory value..
Thats why you cant do those..
Try to fix your internet connection in ur phone again and try.

Can you reset the device with holding down the volume down button and power button at the same time? just a thought...you will loose all personal info doing this, but you can still us it..

I read something about manually adding a wifi spot...Don't remember where it was but try Samsung dot com

go to your wifi page and do a search will progressively getting closer to you modem... if it doesn't see it in range at all, check with your internet provider as something may be conflicting... I've had no problems connecting to my home wifi or wifi spots all over the state of Florida and I have the same Tab. Wonderful product and you will enjoy it. Also some apps are made for mobile phones only and will not work with the tabs... keep this in mind

All data will be lost! Remember to back up any important data before doing a hard reset.

When the phone is turned off, press and hold the Home key + Volume down key + Power key for over 10 seconds. When the screen shows the LG logo, release the Power key.
After the screen shows the hard reset screen, release the other keys.
Leave your phone for at least a minute while it performs the hard reset, then your phone will be turned on.

anothewr way is :

reset phone to factory settings and erase all the data on your phone, touch Menu > Settings> Privacy > Factory data reset > Reset phone.

Resetting the phone does not erase any system software updates you have downloaded or any files on your microSD card,
such as music or photos. If you reset the phone in this way, you are prompted to re-enter the same information that you did when you first started Android.

Try connecting to your router at this address192.168.1.1 (linksys)192.168.0.1 (d-link)
type in the user and passwordif none it's usually just admin for the passwordchange your wifi settings from there
If none of the above works, one the router there is a soft reset button.Hold that button for 10 seconds and your router should reset to factorysettings.

so you have a wireless router at home? if you dont have,you should get one or you can try to go to some place with free wifi like coffee shops,libraries,etc. The reason why it keeps on saying WLAN NOT FOUND is that ,theres no wireless signal in your area..or signal is too poor that your phone cant reach..

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.